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1// SPDX-License-Identifier: GPL-1.0+
2/*
3 * Device driver for Microgate SyncLink GT serial adapters.
4 *
5 * written by Paul Fulghum for Microgate Corporation
6 * paulkf@microgate.com
7 *
8 * Microgate and SyncLink are trademarks of Microgate Corporation
9 *
10 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
11 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
12 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
13 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
14 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
15 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
16 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
17 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
18 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
19 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
20 * OF THE POSSIBILITY OF SUCH DAMAGE.
21 */
22
23/*
24 * DEBUG OUTPUT DEFINITIONS
25 *
26 * uncomment lines below to enable specific types of debug output
27 *
28 * DBGINFO information - most verbose output
29 * DBGERR serious errors
30 * DBGBH bottom half service routine debugging
31 * DBGISR interrupt service routine debugging
32 * DBGDATA output receive and transmit data
33 * DBGTBUF output transmit DMA buffers and registers
34 * DBGRBUF output receive DMA buffers and registers
35 */
36
37#define DBGINFO(fmt) if (debug_level >= DEBUG_LEVEL_INFO) printk fmt
38#define DBGERR(fmt) if (debug_level >= DEBUG_LEVEL_ERROR) printk fmt
39#define DBGBH(fmt) if (debug_level >= DEBUG_LEVEL_BH) printk fmt
40#define DBGISR(fmt) if (debug_level >= DEBUG_LEVEL_ISR) printk fmt
41#define DBGDATA(info, buf, size, label) if (debug_level >= DEBUG_LEVEL_DATA) trace_block((info), (buf), (size), (label))
42/*#define DBGTBUF(info) dump_tbufs(info)*/
43/*#define DBGRBUF(info) dump_rbufs(info)*/
44
45
46#include <linux/module.h>
47#include <linux/errno.h>
48#include <linux/signal.h>
49#include <linux/sched.h>
50#include <linux/timer.h>
51#include <linux/interrupt.h>
52#include <linux/pci.h>
53#include <linux/tty.h>
54#include <linux/tty_flip.h>
55#include <linux/serial.h>
56#include <linux/major.h>
57#include <linux/string.h>
58#include <linux/fcntl.h>
59#include <linux/ptrace.h>
60#include <linux/ioport.h>
61#include <linux/mm.h>
62#include <linux/seq_file.h>
63#include <linux/slab.h>
64#include <linux/netdevice.h>
65#include <linux/vmalloc.h>
66#include <linux/init.h>
67#include <linux/delay.h>
68#include <linux/ioctl.h>
69#include <linux/termios.h>
70#include <linux/bitops.h>
71#include <linux/workqueue.h>
72#include <linux/hdlc.h>
73#include <linux/synclink.h>
74
75#include <asm/io.h>
76#include <asm/irq.h>
77#include <asm/dma.h>
78#include <asm/types.h>
79#include <linux/uaccess.h>
80
81#if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINK_GT_MODULE))
82#define SYNCLINK_GENERIC_HDLC 1
83#else
84#define SYNCLINK_GENERIC_HDLC 0
85#endif
86
87/*
88 * module identification
89 */
90static char *driver_name = "SyncLink GT";
91static char *slgt_driver_name = "synclink_gt";
92static char *tty_dev_prefix = "ttySLG";
93MODULE_LICENSE("GPL");
94#define MGSL_MAGIC 0x5401
95#define MAX_DEVICES 32
96
97static const struct pci_device_id pci_table[] = {
98 {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
99 {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT2_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
100 {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT4_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
101 {PCI_VENDOR_ID_MICROGATE, SYNCLINK_AC_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
102 {0,}, /* terminate list */
103};
104MODULE_DEVICE_TABLE(pci, pci_table);
105
106static int init_one(struct pci_dev *dev,const struct pci_device_id *ent);
107static void remove_one(struct pci_dev *dev);
108static struct pci_driver pci_driver = {
109 .name = "synclink_gt",
110 .id_table = pci_table,
111 .probe = init_one,
112 .remove = remove_one,
113};
114
115static bool pci_registered;
116
117/*
118 * module configuration and status
119 */
120static struct slgt_info *slgt_device_list;
121static int slgt_device_count;
122
123static int ttymajor;
124static int debug_level;
125static int maxframe[MAX_DEVICES];
126
127module_param(ttymajor, int, 0);
128module_param(debug_level, int, 0);
129module_param_array(maxframe, int, NULL, 0);
130
131MODULE_PARM_DESC(ttymajor, "TTY major device number override: 0=auto assigned");
132MODULE_PARM_DESC(debug_level, "Debug syslog output: 0=disabled, 1 to 5=increasing detail");
133MODULE_PARM_DESC(maxframe, "Maximum frame size used by device (4096 to 65535)");
134
135/*
136 * tty support and callbacks
137 */
138static struct tty_driver *serial_driver;
139
140static int open(struct tty_struct *tty, struct file * filp);
141static void close(struct tty_struct *tty, struct file * filp);
142static void hangup(struct tty_struct *tty);
143static void set_termios(struct tty_struct *tty, struct ktermios *old_termios);
144
145static int write(struct tty_struct *tty, const unsigned char *buf, int count);
146static int put_char(struct tty_struct *tty, unsigned char ch);
147static void send_xchar(struct tty_struct *tty, char ch);
148static void wait_until_sent(struct tty_struct *tty, int timeout);
149static int write_room(struct tty_struct *tty);
150static void flush_chars(struct tty_struct *tty);
151static void flush_buffer(struct tty_struct *tty);
152static void tx_hold(struct tty_struct *tty);
153static void tx_release(struct tty_struct *tty);
154
155static int ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg);
156static int chars_in_buffer(struct tty_struct *tty);
157static void throttle(struct tty_struct * tty);
158static void unthrottle(struct tty_struct * tty);
159static int set_break(struct tty_struct *tty, int break_state);
160
161/*
162 * generic HDLC support and callbacks
163 */
164#if SYNCLINK_GENERIC_HDLC
165#define dev_to_port(D) (dev_to_hdlc(D)->priv)
166static void hdlcdev_tx_done(struct slgt_info *info);
167static void hdlcdev_rx(struct slgt_info *info, char *buf, int size);
168static int hdlcdev_init(struct slgt_info *info);
169static void hdlcdev_exit(struct slgt_info *info);
170#endif
171
172
173/*
174 * device specific structures, macros and functions
175 */
176
177#define SLGT_MAX_PORTS 4
178#define SLGT_REG_SIZE 256
179
180/*
181 * conditional wait facility
182 */
183struct cond_wait {
184 struct cond_wait *next;
185 wait_queue_head_t q;
186 wait_queue_entry_t wait;
187 unsigned int data;
188};
189static void init_cond_wait(struct cond_wait *w, unsigned int data);
190static void add_cond_wait(struct cond_wait **head, struct cond_wait *w);
191static void remove_cond_wait(struct cond_wait **head, struct cond_wait *w);
192static void flush_cond_wait(struct cond_wait **head);
193
194/*
195 * DMA buffer descriptor and access macros
196 */
197struct slgt_desc
198{
199 __le16 count;
200 __le16 status;
201 __le32 pbuf; /* physical address of data buffer */
202 __le32 next; /* physical address of next descriptor */
203
204 /* driver book keeping */
205 char *buf; /* virtual address of data buffer */
206 unsigned int pdesc; /* physical address of this descriptor */
207 dma_addr_t buf_dma_addr;
208 unsigned short buf_count;
209};
210
211#define set_desc_buffer(a,b) (a).pbuf = cpu_to_le32((unsigned int)(b))
212#define set_desc_next(a,b) (a).next = cpu_to_le32((unsigned int)(b))
213#define set_desc_count(a,b)(a).count = cpu_to_le16((unsigned short)(b))
214#define set_desc_eof(a,b) (a).status = cpu_to_le16((b) ? (le16_to_cpu((a).status) | BIT0) : (le16_to_cpu((a).status) & ~BIT0))
215#define set_desc_status(a, b) (a).status = cpu_to_le16((unsigned short)(b))
216#define desc_count(a) (le16_to_cpu((a).count))
217#define desc_status(a) (le16_to_cpu((a).status))
218#define desc_complete(a) (le16_to_cpu((a).status) & BIT15)
219#define desc_eof(a) (le16_to_cpu((a).status) & BIT2)
220#define desc_crc_error(a) (le16_to_cpu((a).status) & BIT1)
221#define desc_abort(a) (le16_to_cpu((a).status) & BIT0)
222#define desc_residue(a) ((le16_to_cpu((a).status) & 0x38) >> 3)
223
224struct _input_signal_events {
225 int ri_up;
226 int ri_down;
227 int dsr_up;
228 int dsr_down;
229 int dcd_up;
230 int dcd_down;
231 int cts_up;
232 int cts_down;
233};
234
235/*
236 * device instance data structure
237 */
238struct slgt_info {
239 void *if_ptr; /* General purpose pointer (used by SPPP) */
240 struct tty_port port;
241
242 struct slgt_info *next_device; /* device list link */
243
244 int magic;
245
246 char device_name[25];
247 struct pci_dev *pdev;
248
249 int port_count; /* count of ports on adapter */
250 int adapter_num; /* adapter instance number */
251 int port_num; /* port instance number */
252
253 /* array of pointers to port contexts on this adapter */
254 struct slgt_info *port_array[SLGT_MAX_PORTS];
255
256 int line; /* tty line instance number */
257
258 struct mgsl_icount icount;
259
260 int timeout;
261 int x_char; /* xon/xoff character */
262 unsigned int read_status_mask;
263 unsigned int ignore_status_mask;
264
265 wait_queue_head_t status_event_wait_q;
266 wait_queue_head_t event_wait_q;
267 struct timer_list tx_timer;
268 struct timer_list rx_timer;
269
270 unsigned int gpio_present;
271 struct cond_wait *gpio_wait_q;
272
273 spinlock_t lock; /* spinlock for synchronizing with ISR */
274
275 struct work_struct task;
276 u32 pending_bh;
277 bool bh_requested;
278 bool bh_running;
279
280 int isr_overflow;
281 bool irq_requested; /* true if IRQ requested */
282 bool irq_occurred; /* for diagnostics use */
283
284 /* device configuration */
285
286 unsigned int bus_type;
287 unsigned int irq_level;
288 unsigned long irq_flags;
289
290 unsigned char __iomem * reg_addr; /* memory mapped registers address */
291 u32 phys_reg_addr;
292 bool reg_addr_requested;
293
294 MGSL_PARAMS params; /* communications parameters */
295 u32 idle_mode;
296 u32 max_frame_size; /* as set by device config */
297
298 unsigned int rbuf_fill_level;
299 unsigned int rx_pio;
300 unsigned int if_mode;
301 unsigned int base_clock;
302 unsigned int xsync;
303 unsigned int xctrl;
304
305 /* device status */
306
307 bool rx_enabled;
308 bool rx_restart;
309
310 bool tx_enabled;
311 bool tx_active;
312
313 unsigned char signals; /* serial signal states */
314 int init_error; /* initialization error */
315
316 unsigned char *tx_buf;
317 int tx_count;
318
319 char *flag_buf;
320 bool drop_rts_on_tx_done;
321 struct _input_signal_events input_signal_events;
322
323 int dcd_chkcount; /* check counts to prevent */
324 int cts_chkcount; /* too many IRQs if a signal */
325 int dsr_chkcount; /* is floating */
326 int ri_chkcount;
327
328 char *bufs; /* virtual address of DMA buffer lists */
329 dma_addr_t bufs_dma_addr; /* physical address of buffer descriptors */
330
331 unsigned int rbuf_count;
332 struct slgt_desc *rbufs;
333 unsigned int rbuf_current;
334 unsigned int rbuf_index;
335 unsigned int rbuf_fill_index;
336 unsigned short rbuf_fill_count;
337
338 unsigned int tbuf_count;
339 struct slgt_desc *tbufs;
340 unsigned int tbuf_current;
341 unsigned int tbuf_start;
342
343 unsigned char *tmp_rbuf;
344 unsigned int tmp_rbuf_count;
345
346 /* SPPP/Cisco HDLC device parts */
347
348 int netcount;
349 spinlock_t netlock;
350#if SYNCLINK_GENERIC_HDLC
351 struct net_device *netdev;
352#endif
353
354};
355
356static MGSL_PARAMS default_params = {
357 .mode = MGSL_MODE_HDLC,
358 .loopback = 0,
359 .flags = HDLC_FLAG_UNDERRUN_ABORT15,
360 .encoding = HDLC_ENCODING_NRZI_SPACE,
361 .clock_speed = 0,
362 .addr_filter = 0xff,
363 .crc_type = HDLC_CRC_16_CCITT,
364 .preamble_length = HDLC_PREAMBLE_LENGTH_8BITS,
365 .preamble = HDLC_PREAMBLE_PATTERN_NONE,
366 .data_rate = 9600,
367 .data_bits = 8,
368 .stop_bits = 1,
369 .parity = ASYNC_PARITY_NONE
370};
371
372
373#define BH_RECEIVE 1
374#define BH_TRANSMIT 2
375#define BH_STATUS 4
376#define IO_PIN_SHUTDOWN_LIMIT 100
377
378#define DMABUFSIZE 256
379#define DESC_LIST_SIZE 4096
380
381#define MASK_PARITY BIT1
382#define MASK_FRAMING BIT0
383#define MASK_BREAK BIT14
384#define MASK_OVERRUN BIT4
385
386#define GSR 0x00 /* global status */
387#define JCR 0x04 /* JTAG control */
388#define IODR 0x08 /* GPIO direction */
389#define IOER 0x0c /* GPIO interrupt enable */
390#define IOVR 0x10 /* GPIO value */
391#define IOSR 0x14 /* GPIO interrupt status */
392#define TDR 0x80 /* tx data */
393#define RDR 0x80 /* rx data */
394#define TCR 0x82 /* tx control */
395#define TIR 0x84 /* tx idle */
396#define TPR 0x85 /* tx preamble */
397#define RCR 0x86 /* rx control */
398#define VCR 0x88 /* V.24 control */
399#define CCR 0x89 /* clock control */
400#define BDR 0x8a /* baud divisor */
401#define SCR 0x8c /* serial control */
402#define SSR 0x8e /* serial status */
403#define RDCSR 0x90 /* rx DMA control/status */
404#define TDCSR 0x94 /* tx DMA control/status */
405#define RDDAR 0x98 /* rx DMA descriptor address */
406#define TDDAR 0x9c /* tx DMA descriptor address */
407#define XSR 0x40 /* extended sync pattern */
408#define XCR 0x44 /* extended control */
409
410#define RXIDLE BIT14
411#define RXBREAK BIT14
412#define IRQ_TXDATA BIT13
413#define IRQ_TXIDLE BIT12
414#define IRQ_TXUNDER BIT11 /* HDLC */
415#define IRQ_RXDATA BIT10
416#define IRQ_RXIDLE BIT9 /* HDLC */
417#define IRQ_RXBREAK BIT9 /* async */
418#define IRQ_RXOVER BIT8
419#define IRQ_DSR BIT7
420#define IRQ_CTS BIT6
421#define IRQ_DCD BIT5
422#define IRQ_RI BIT4
423#define IRQ_ALL 0x3ff0
424#define IRQ_MASTER BIT0
425
426#define slgt_irq_on(info, mask) \
427 wr_reg16((info), SCR, (unsigned short)(rd_reg16((info), SCR) | (mask)))
428#define slgt_irq_off(info, mask) \
429 wr_reg16((info), SCR, (unsigned short)(rd_reg16((info), SCR) & ~(mask)))
430
431static __u8 rd_reg8(struct slgt_info *info, unsigned int addr);
432static void wr_reg8(struct slgt_info *info, unsigned int addr, __u8 value);
433static __u16 rd_reg16(struct slgt_info *info, unsigned int addr);
434static void wr_reg16(struct slgt_info *info, unsigned int addr, __u16 value);
435static __u32 rd_reg32(struct slgt_info *info, unsigned int addr);
436static void wr_reg32(struct slgt_info *info, unsigned int addr, __u32 value);
437
438static void msc_set_vcr(struct slgt_info *info);
439
440static int startup(struct slgt_info *info);
441static int block_til_ready(struct tty_struct *tty, struct file * filp,struct slgt_info *info);
442static void shutdown(struct slgt_info *info);
443static void program_hw(struct slgt_info *info);
444static void change_params(struct slgt_info *info);
445
446static int register_test(struct slgt_info *info);
447static int irq_test(struct slgt_info *info);
448static int loopback_test(struct slgt_info *info);
449static int adapter_test(struct slgt_info *info);
450
451static void reset_adapter(struct slgt_info *info);
452static void reset_port(struct slgt_info *info);
453static void async_mode(struct slgt_info *info);
454static void sync_mode(struct slgt_info *info);
455
456static void rx_stop(struct slgt_info *info);
457static void rx_start(struct slgt_info *info);
458static void reset_rbufs(struct slgt_info *info);
459static void free_rbufs(struct slgt_info *info, unsigned int first, unsigned int last);
460static void rdma_reset(struct slgt_info *info);
461static bool rx_get_frame(struct slgt_info *info);
462static bool rx_get_buf(struct slgt_info *info);
463
464static void tx_start(struct slgt_info *info);
465static void tx_stop(struct slgt_info *info);
466static void tx_set_idle(struct slgt_info *info);
467static unsigned int free_tbuf_count(struct slgt_info *info);
468static unsigned int tbuf_bytes(struct slgt_info *info);
469static void reset_tbufs(struct slgt_info *info);
470static void tdma_reset(struct slgt_info *info);
471static bool tx_load(struct slgt_info *info, const char *buf, unsigned int count);
472
473static void get_signals(struct slgt_info *info);
474static void set_signals(struct slgt_info *info);
475static void enable_loopback(struct slgt_info *info);
476static void set_rate(struct slgt_info *info, u32 data_rate);
477
478static int bh_action(struct slgt_info *info);
479static void bh_handler(struct work_struct *work);
480static void bh_transmit(struct slgt_info *info);
481static void isr_serial(struct slgt_info *info);
482static void isr_rdma(struct slgt_info *info);
483static void isr_txeom(struct slgt_info *info, unsigned short status);
484static void isr_tdma(struct slgt_info *info);
485
486static int alloc_dma_bufs(struct slgt_info *info);
487static void free_dma_bufs(struct slgt_info *info);
488static int alloc_desc(struct slgt_info *info);
489static void free_desc(struct slgt_info *info);
490static int alloc_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count);
491static void free_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count);
492
493static int alloc_tmp_rbuf(struct slgt_info *info);
494static void free_tmp_rbuf(struct slgt_info *info);
495
496static void tx_timeout(struct timer_list *t);
497static void rx_timeout(struct timer_list *t);
498
499/*
500 * ioctl handlers
501 */
502static int get_stats(struct slgt_info *info, struct mgsl_icount __user *user_icount);
503static int get_params(struct slgt_info *info, MGSL_PARAMS __user *params);
504static int set_params(struct slgt_info *info, MGSL_PARAMS __user *params);
505static int get_txidle(struct slgt_info *info, int __user *idle_mode);
506static int set_txidle(struct slgt_info *info, int idle_mode);
507static int tx_enable(struct slgt_info *info, int enable);
508static int tx_abort(struct slgt_info *info);
509static int rx_enable(struct slgt_info *info, int enable);
510static int modem_input_wait(struct slgt_info *info,int arg);
511static int wait_mgsl_event(struct slgt_info *info, int __user *mask_ptr);
512static int tiocmget(struct tty_struct *tty);
513static int tiocmset(struct tty_struct *tty,
514 unsigned int set, unsigned int clear);
515static int set_break(struct tty_struct *tty, int break_state);
516static int get_interface(struct slgt_info *info, int __user *if_mode);
517static int set_interface(struct slgt_info *info, int if_mode);
518static int set_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
519static int get_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
520static int wait_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
521static int get_xsync(struct slgt_info *info, int __user *if_mode);
522static int set_xsync(struct slgt_info *info, int if_mode);
523static int get_xctrl(struct slgt_info *info, int __user *if_mode);
524static int set_xctrl(struct slgt_info *info, int if_mode);
525
526/*
527 * driver functions
528 */
529static void add_device(struct slgt_info *info);
530static void device_init(int adapter_num, struct pci_dev *pdev);
531static int claim_resources(struct slgt_info *info);
532static void release_resources(struct slgt_info *info);
533
534/*
535 * DEBUG OUTPUT CODE
536 */
537#ifndef DBGINFO
538#define DBGINFO(fmt)
539#endif
540#ifndef DBGERR
541#define DBGERR(fmt)
542#endif
543#ifndef DBGBH
544#define DBGBH(fmt)
545#endif
546#ifndef DBGISR
547#define DBGISR(fmt)
548#endif
549
550#ifdef DBGDATA
551static void trace_block(struct slgt_info *info, const char *data, int count, const char *label)
552{
553 int i;
554 int linecount;
555 printk("%s %s data:\n",info->device_name, label);
556 while(count) {
557 linecount = (count > 16) ? 16 : count;
558 for(i=0; i < linecount; i++)
559 printk("%02X ",(unsigned char)data[i]);
560 for(;i<17;i++)
561 printk(" ");
562 for(i=0;i<linecount;i++) {
563 if (data[i]>=040 && data[i]<=0176)
564 printk("%c",data[i]);
565 else
566 printk(".");
567 }
568 printk("\n");
569 data += linecount;
570 count -= linecount;
571 }
572}
573#else
574#define DBGDATA(info, buf, size, label)
575#endif
576
577#ifdef DBGTBUF
578static void dump_tbufs(struct slgt_info *info)
579{
580 int i;
581 printk("tbuf_current=%d\n", info->tbuf_current);
582 for (i=0 ; i < info->tbuf_count ; i++) {
583 printk("%d: count=%04X status=%04X\n",
584 i, le16_to_cpu(info->tbufs[i].count), le16_to_cpu(info->tbufs[i].status));
585 }
586}
587#else
588#define DBGTBUF(info)
589#endif
590
591#ifdef DBGRBUF
592static void dump_rbufs(struct slgt_info *info)
593{
594 int i;
595 printk("rbuf_current=%d\n", info->rbuf_current);
596 for (i=0 ; i < info->rbuf_count ; i++) {
597 printk("%d: count=%04X status=%04X\n",
598 i, le16_to_cpu(info->rbufs[i].count), le16_to_cpu(info->rbufs[i].status));
599 }
600}
601#else
602#define DBGRBUF(info)
603#endif
604
605static inline int sanity_check(struct slgt_info *info, char *devname, const char *name)
606{
607#ifdef SANITY_CHECK
608 if (!info) {
609 printk("null struct slgt_info for (%s) in %s\n", devname, name);
610 return 1;
611 }
612 if (info->magic != MGSL_MAGIC) {
613 printk("bad magic number struct slgt_info (%s) in %s\n", devname, name);
614 return 1;
615 }
616#else
617 if (!info)
618 return 1;
619#endif
620 return 0;
621}
622
623/**
624 * line discipline callback wrappers
625 *
626 * The wrappers maintain line discipline references
627 * while calling into the line discipline.
628 *
629 * ldisc_receive_buf - pass receive data to line discipline
630 */
631static void ldisc_receive_buf(struct tty_struct *tty,
632 const __u8 *data, char *flags, int count)
633{
634 struct tty_ldisc *ld;
635 if (!tty)
636 return;
637 ld = tty_ldisc_ref(tty);
638 if (ld) {
639 if (ld->ops->receive_buf)
640 ld->ops->receive_buf(tty, data, flags, count);
641 tty_ldisc_deref(ld);
642 }
643}
644
645/* tty callbacks */
646
647static int open(struct tty_struct *tty, struct file *filp)
648{
649 struct slgt_info *info;
650 int retval, line;
651 unsigned long flags;
652
653 line = tty->index;
654 if (line >= slgt_device_count) {
655 DBGERR(("%s: open with invalid line #%d.\n", driver_name, line));
656 return -ENODEV;
657 }
658
659 info = slgt_device_list;
660 while(info && info->line != line)
661 info = info->next_device;
662 if (sanity_check(info, tty->name, "open"))
663 return -ENODEV;
664 if (info->init_error) {
665 DBGERR(("%s init error=%d\n", info->device_name, info->init_error));
666 return -ENODEV;
667 }
668
669 tty->driver_data = info;
670 info->port.tty = tty;
671
672 DBGINFO(("%s open, old ref count = %d\n", info->device_name, info->port.count));
673
674 mutex_lock(&info->port.mutex);
675 info->port.low_latency = (info->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0;
676
677 spin_lock_irqsave(&info->netlock, flags);
678 if (info->netcount) {
679 retval = -EBUSY;
680 spin_unlock_irqrestore(&info->netlock, flags);
681 mutex_unlock(&info->port.mutex);
682 goto cleanup;
683 }
684 info->port.count++;
685 spin_unlock_irqrestore(&info->netlock, flags);
686
687 if (info->port.count == 1) {
688 /* 1st open on this device, init hardware */
689 retval = startup(info);
690 if (retval < 0) {
691 mutex_unlock(&info->port.mutex);
692 goto cleanup;
693 }
694 }
695 mutex_unlock(&info->port.mutex);
696 retval = block_til_ready(tty, filp, info);
697 if (retval) {
698 DBGINFO(("%s block_til_ready rc=%d\n", info->device_name, retval));
699 goto cleanup;
700 }
701
702 retval = 0;
703
704cleanup:
705 if (retval) {
706 if (tty->count == 1)
707 info->port.tty = NULL; /* tty layer will release tty struct */
708 if(info->port.count)
709 info->port.count--;
710 }
711
712 DBGINFO(("%s open rc=%d\n", info->device_name, retval));
713 return retval;
714}
715
716static void close(struct tty_struct *tty, struct file *filp)
717{
718 struct slgt_info *info = tty->driver_data;
719
720 if (sanity_check(info, tty->name, "close"))
721 return;
722 DBGINFO(("%s close entry, count=%d\n", info->device_name, info->port.count));
723
724 if (tty_port_close_start(&info->port, tty, filp) == 0)
725 goto cleanup;
726
727 mutex_lock(&info->port.mutex);
728 if (tty_port_initialized(&info->port))
729 wait_until_sent(tty, info->timeout);
730 flush_buffer(tty);
731 tty_ldisc_flush(tty);
732
733 shutdown(info);
734 mutex_unlock(&info->port.mutex);
735
736 tty_port_close_end(&info->port, tty);
737 info->port.tty = NULL;
738cleanup:
739 DBGINFO(("%s close exit, count=%d\n", tty->driver->name, info->port.count));
740}
741
742static void hangup(struct tty_struct *tty)
743{
744 struct slgt_info *info = tty->driver_data;
745 unsigned long flags;
746
747 if (sanity_check(info, tty->name, "hangup"))
748 return;
749 DBGINFO(("%s hangup\n", info->device_name));
750
751 flush_buffer(tty);
752
753 mutex_lock(&info->port.mutex);
754 shutdown(info);
755
756 spin_lock_irqsave(&info->port.lock, flags);
757 info->port.count = 0;
758 info->port.tty = NULL;
759 spin_unlock_irqrestore(&info->port.lock, flags);
760 tty_port_set_active(&info->port, 0);
761 mutex_unlock(&info->port.mutex);
762
763 wake_up_interruptible(&info->port.open_wait);
764}
765
766static void set_termios(struct tty_struct *tty, struct ktermios *old_termios)
767{
768 struct slgt_info *info = tty->driver_data;
769 unsigned long flags;
770
771 DBGINFO(("%s set_termios\n", tty->driver->name));
772
773 change_params(info);
774
775 /* Handle transition to B0 status */
776 if ((old_termios->c_cflag & CBAUD) && !C_BAUD(tty)) {
777 info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
778 spin_lock_irqsave(&info->lock,flags);
779 set_signals(info);
780 spin_unlock_irqrestore(&info->lock,flags);
781 }
782
783 /* Handle transition away from B0 status */
784 if (!(old_termios->c_cflag & CBAUD) && C_BAUD(tty)) {
785 info->signals |= SerialSignal_DTR;
786 if (!C_CRTSCTS(tty) || !tty_throttled(tty))
787 info->signals |= SerialSignal_RTS;
788 spin_lock_irqsave(&info->lock,flags);
789 set_signals(info);
790 spin_unlock_irqrestore(&info->lock,flags);
791 }
792
793 /* Handle turning off CRTSCTS */
794 if ((old_termios->c_cflag & CRTSCTS) && !C_CRTSCTS(tty)) {
795 tty->hw_stopped = 0;
796 tx_release(tty);
797 }
798}
799
800static void update_tx_timer(struct slgt_info *info)
801{
802 /*
803 * use worst case speed of 1200bps to calculate transmit timeout
804 * based on data in buffers (tbuf_bytes) and FIFO (128 bytes)
805 */
806 if (info->params.mode == MGSL_MODE_HDLC) {
807 int timeout = (tbuf_bytes(info) * 7) + 1000;
808 mod_timer(&info->tx_timer, jiffies + msecs_to_jiffies(timeout));
809 }
810}
811
812static int write(struct tty_struct *tty,
813 const unsigned char *buf, int count)
814{
815 int ret = 0;
816 struct slgt_info *info = tty->driver_data;
817 unsigned long flags;
818
819 if (sanity_check(info, tty->name, "write"))
820 return -EIO;
821
822 DBGINFO(("%s write count=%d\n", info->device_name, count));
823
824 if (!info->tx_buf || (count > info->max_frame_size))
825 return -EIO;
826
827 if (!count || tty->stopped || tty->hw_stopped)
828 return 0;
829
830 spin_lock_irqsave(&info->lock, flags);
831
832 if (info->tx_count) {
833 /* send accumulated data from send_char() */
834 if (!tx_load(info, info->tx_buf, info->tx_count))
835 goto cleanup;
836 info->tx_count = 0;
837 }
838
839 if (tx_load(info, buf, count))
840 ret = count;
841
842cleanup:
843 spin_unlock_irqrestore(&info->lock, flags);
844 DBGINFO(("%s write rc=%d\n", info->device_name, ret));
845 return ret;
846}
847
848static int put_char(struct tty_struct *tty, unsigned char ch)
849{
850 struct slgt_info *info = tty->driver_data;
851 unsigned long flags;
852 int ret = 0;
853
854 if (sanity_check(info, tty->name, "put_char"))
855 return 0;
856 DBGINFO(("%s put_char(%d)\n", info->device_name, ch));
857 if (!info->tx_buf)
858 return 0;
859 spin_lock_irqsave(&info->lock,flags);
860 if (info->tx_count < info->max_frame_size) {
861 info->tx_buf[info->tx_count++] = ch;
862 ret = 1;
863 }
864 spin_unlock_irqrestore(&info->lock,flags);
865 return ret;
866}
867
868static void send_xchar(struct tty_struct *tty, char ch)
869{
870 struct slgt_info *info = tty->driver_data;
871 unsigned long flags;
872
873 if (sanity_check(info, tty->name, "send_xchar"))
874 return;
875 DBGINFO(("%s send_xchar(%d)\n", info->device_name, ch));
876 info->x_char = ch;
877 if (ch) {
878 spin_lock_irqsave(&info->lock,flags);
879 if (!info->tx_enabled)
880 tx_start(info);
881 spin_unlock_irqrestore(&info->lock,flags);
882 }
883}
884
885static void wait_until_sent(struct tty_struct *tty, int timeout)
886{
887 struct slgt_info *info = tty->driver_data;
888 unsigned long orig_jiffies, char_time;
889
890 if (!info )
891 return;
892 if (sanity_check(info, tty->name, "wait_until_sent"))
893 return;
894 DBGINFO(("%s wait_until_sent entry\n", info->device_name));
895 if (!tty_port_initialized(&info->port))
896 goto exit;
897
898 orig_jiffies = jiffies;
899
900 /* Set check interval to 1/5 of estimated time to
901 * send a character, and make it at least 1. The check
902 * interval should also be less than the timeout.
903 * Note: use tight timings here to satisfy the NIST-PCTS.
904 */
905
906 if (info->params.data_rate) {
907 char_time = info->timeout/(32 * 5);
908 if (!char_time)
909 char_time++;
910 } else
911 char_time = 1;
912
913 if (timeout)
914 char_time = min_t(unsigned long, char_time, timeout);
915
916 while (info->tx_active) {
917 msleep_interruptible(jiffies_to_msecs(char_time));
918 if (signal_pending(current))
919 break;
920 if (timeout && time_after(jiffies, orig_jiffies + timeout))
921 break;
922 }
923exit:
924 DBGINFO(("%s wait_until_sent exit\n", info->device_name));
925}
926
927static int write_room(struct tty_struct *tty)
928{
929 struct slgt_info *info = tty->driver_data;
930 int ret;
931
932 if (sanity_check(info, tty->name, "write_room"))
933 return 0;
934 ret = (info->tx_active) ? 0 : HDLC_MAX_FRAME_SIZE;
935 DBGINFO(("%s write_room=%d\n", info->device_name, ret));
936 return ret;
937}
938
939static void flush_chars(struct tty_struct *tty)
940{
941 struct slgt_info *info = tty->driver_data;
942 unsigned long flags;
943
944 if (sanity_check(info, tty->name, "flush_chars"))
945 return;
946 DBGINFO(("%s flush_chars entry tx_count=%d\n", info->device_name, info->tx_count));
947
948 if (info->tx_count <= 0 || tty->stopped ||
949 tty->hw_stopped || !info->tx_buf)
950 return;
951
952 DBGINFO(("%s flush_chars start transmit\n", info->device_name));
953
954 spin_lock_irqsave(&info->lock,flags);
955 if (info->tx_count && tx_load(info, info->tx_buf, info->tx_count))
956 info->tx_count = 0;
957 spin_unlock_irqrestore(&info->lock,flags);
958}
959
960static void flush_buffer(struct tty_struct *tty)
961{
962 struct slgt_info *info = tty->driver_data;
963 unsigned long flags;
964
965 if (sanity_check(info, tty->name, "flush_buffer"))
966 return;
967 DBGINFO(("%s flush_buffer\n", info->device_name));
968
969 spin_lock_irqsave(&info->lock, flags);
970 info->tx_count = 0;
971 spin_unlock_irqrestore(&info->lock, flags);
972
973 tty_wakeup(tty);
974}
975
976/*
977 * throttle (stop) transmitter
978 */
979static void tx_hold(struct tty_struct *tty)
980{
981 struct slgt_info *info = tty->driver_data;
982 unsigned long flags;
983
984 if (sanity_check(info, tty->name, "tx_hold"))
985 return;
986 DBGINFO(("%s tx_hold\n", info->device_name));
987 spin_lock_irqsave(&info->lock,flags);
988 if (info->tx_enabled && info->params.mode == MGSL_MODE_ASYNC)
989 tx_stop(info);
990 spin_unlock_irqrestore(&info->lock,flags);
991}
992
993/*
994 * release (start) transmitter
995 */
996static void tx_release(struct tty_struct *tty)
997{
998 struct slgt_info *info = tty->driver_data;
999 unsigned long flags;
1000
1001 if (sanity_check(info, tty->name, "tx_release"))
1002 return;
1003 DBGINFO(("%s tx_release\n", info->device_name));
1004 spin_lock_irqsave(&info->lock, flags);
1005 if (info->tx_count && tx_load(info, info->tx_buf, info->tx_count))
1006 info->tx_count = 0;
1007 spin_unlock_irqrestore(&info->lock, flags);
1008}
1009
1010/*
1011 * Service an IOCTL request
1012 *
1013 * Arguments
1014 *
1015 * tty pointer to tty instance data
1016 * cmd IOCTL command code
1017 * arg command argument/context
1018 *
1019 * Return 0 if success, otherwise error code
1020 */
1021static int ioctl(struct tty_struct *tty,
1022 unsigned int cmd, unsigned long arg)
1023{
1024 struct slgt_info *info = tty->driver_data;
1025 void __user *argp = (void __user *)arg;
1026 int ret;
1027
1028 if (sanity_check(info, tty->name, "ioctl"))
1029 return -ENODEV;
1030 DBGINFO(("%s ioctl() cmd=%08X\n", info->device_name, cmd));
1031
1032 if (cmd != TIOCMIWAIT) {
1033 if (tty_io_error(tty))
1034 return -EIO;
1035 }
1036
1037 switch (cmd) {
1038 case MGSL_IOCWAITEVENT:
1039 return wait_mgsl_event(info, argp);
1040 case TIOCMIWAIT:
1041 return modem_input_wait(info,(int)arg);
1042 case MGSL_IOCSGPIO:
1043 return set_gpio(info, argp);
1044 case MGSL_IOCGGPIO:
1045 return get_gpio(info, argp);
1046 case MGSL_IOCWAITGPIO:
1047 return wait_gpio(info, argp);
1048 case MGSL_IOCGXSYNC:
1049 return get_xsync(info, argp);
1050 case MGSL_IOCSXSYNC:
1051 return set_xsync(info, (int)arg);
1052 case MGSL_IOCGXCTRL:
1053 return get_xctrl(info, argp);
1054 case MGSL_IOCSXCTRL:
1055 return set_xctrl(info, (int)arg);
1056 }
1057 mutex_lock(&info->port.mutex);
1058 switch (cmd) {
1059 case MGSL_IOCGPARAMS:
1060 ret = get_params(info, argp);
1061 break;
1062 case MGSL_IOCSPARAMS:
1063 ret = set_params(info, argp);
1064 break;
1065 case MGSL_IOCGTXIDLE:
1066 ret = get_txidle(info, argp);
1067 break;
1068 case MGSL_IOCSTXIDLE:
1069 ret = set_txidle(info, (int)arg);
1070 break;
1071 case MGSL_IOCTXENABLE:
1072 ret = tx_enable(info, (int)arg);
1073 break;
1074 case MGSL_IOCRXENABLE:
1075 ret = rx_enable(info, (int)arg);
1076 break;
1077 case MGSL_IOCTXABORT:
1078 ret = tx_abort(info);
1079 break;
1080 case MGSL_IOCGSTATS:
1081 ret = get_stats(info, argp);
1082 break;
1083 case MGSL_IOCGIF:
1084 ret = get_interface(info, argp);
1085 break;
1086 case MGSL_IOCSIF:
1087 ret = set_interface(info,(int)arg);
1088 break;
1089 default:
1090 ret = -ENOIOCTLCMD;
1091 }
1092 mutex_unlock(&info->port.mutex);
1093 return ret;
1094}
1095
1096static int get_icount(struct tty_struct *tty,
1097 struct serial_icounter_struct *icount)
1098
1099{
1100 struct slgt_info *info = tty->driver_data;
1101 struct mgsl_icount cnow; /* kernel counter temps */
1102 unsigned long flags;
1103
1104 spin_lock_irqsave(&info->lock,flags);
1105 cnow = info->icount;
1106 spin_unlock_irqrestore(&info->lock,flags);
1107
1108 icount->cts = cnow.cts;
1109 icount->dsr = cnow.dsr;
1110 icount->rng = cnow.rng;
1111 icount->dcd = cnow.dcd;
1112 icount->rx = cnow.rx;
1113 icount->tx = cnow.tx;
1114 icount->frame = cnow.frame;
1115 icount->overrun = cnow.overrun;
1116 icount->parity = cnow.parity;
1117 icount->brk = cnow.brk;
1118 icount->buf_overrun = cnow.buf_overrun;
1119
1120 return 0;
1121}
1122
1123/*
1124 * support for 32 bit ioctl calls on 64 bit systems
1125 */
1126#ifdef CONFIG_COMPAT
1127static long get_params32(struct slgt_info *info, struct MGSL_PARAMS32 __user *user_params)
1128{
1129 struct MGSL_PARAMS32 tmp_params;
1130
1131 DBGINFO(("%s get_params32\n", info->device_name));
1132 memset(&tmp_params, 0, sizeof(tmp_params));
1133 tmp_params.mode = (compat_ulong_t)info->params.mode;
1134 tmp_params.loopback = info->params.loopback;
1135 tmp_params.flags = info->params.flags;
1136 tmp_params.encoding = info->params.encoding;
1137 tmp_params.clock_speed = (compat_ulong_t)info->params.clock_speed;
1138 tmp_params.addr_filter = info->params.addr_filter;
1139 tmp_params.crc_type = info->params.crc_type;
1140 tmp_params.preamble_length = info->params.preamble_length;
1141 tmp_params.preamble = info->params.preamble;
1142 tmp_params.data_rate = (compat_ulong_t)info->params.data_rate;
1143 tmp_params.data_bits = info->params.data_bits;
1144 tmp_params.stop_bits = info->params.stop_bits;
1145 tmp_params.parity = info->params.parity;
1146 if (copy_to_user(user_params, &tmp_params, sizeof(struct MGSL_PARAMS32)))
1147 return -EFAULT;
1148 return 0;
1149}
1150
1151static long set_params32(struct slgt_info *info, struct MGSL_PARAMS32 __user *new_params)
1152{
1153 struct MGSL_PARAMS32 tmp_params;
1154
1155 DBGINFO(("%s set_params32\n", info->device_name));
1156 if (copy_from_user(&tmp_params, new_params, sizeof(struct MGSL_PARAMS32)))
1157 return -EFAULT;
1158
1159 spin_lock(&info->lock);
1160 if (tmp_params.mode == MGSL_MODE_BASE_CLOCK) {
1161 info->base_clock = tmp_params.clock_speed;
1162 } else {
1163 info->params.mode = tmp_params.mode;
1164 info->params.loopback = tmp_params.loopback;
1165 info->params.flags = tmp_params.flags;
1166 info->params.encoding = tmp_params.encoding;
1167 info->params.clock_speed = tmp_params.clock_speed;
1168 info->params.addr_filter = tmp_params.addr_filter;
1169 info->params.crc_type = tmp_params.crc_type;
1170 info->params.preamble_length = tmp_params.preamble_length;
1171 info->params.preamble = tmp_params.preamble;
1172 info->params.data_rate = tmp_params.data_rate;
1173 info->params.data_bits = tmp_params.data_bits;
1174 info->params.stop_bits = tmp_params.stop_bits;
1175 info->params.parity = tmp_params.parity;
1176 }
1177 spin_unlock(&info->lock);
1178
1179 program_hw(info);
1180
1181 return 0;
1182}
1183
1184static long slgt_compat_ioctl(struct tty_struct *tty,
1185 unsigned int cmd, unsigned long arg)
1186{
1187 struct slgt_info *info = tty->driver_data;
1188 int rc;
1189
1190 if (sanity_check(info, tty->name, "compat_ioctl"))
1191 return -ENODEV;
1192 DBGINFO(("%s compat_ioctl() cmd=%08X\n", info->device_name, cmd));
1193
1194 switch (cmd) {
1195 case MGSL_IOCSPARAMS32:
1196 rc = set_params32(info, compat_ptr(arg));
1197 break;
1198
1199 case MGSL_IOCGPARAMS32:
1200 rc = get_params32(info, compat_ptr(arg));
1201 break;
1202
1203 case MGSL_IOCGPARAMS:
1204 case MGSL_IOCSPARAMS:
1205 case MGSL_IOCGTXIDLE:
1206 case MGSL_IOCGSTATS:
1207 case MGSL_IOCWAITEVENT:
1208 case MGSL_IOCGIF:
1209 case MGSL_IOCSGPIO:
1210 case MGSL_IOCGGPIO:
1211 case MGSL_IOCWAITGPIO:
1212 case MGSL_IOCGXSYNC:
1213 case MGSL_IOCGXCTRL:
1214 rc = ioctl(tty, cmd, (unsigned long)compat_ptr(arg));
1215 break;
1216 default:
1217 rc = ioctl(tty, cmd, arg);
1218 }
1219 DBGINFO(("%s compat_ioctl() cmd=%08X rc=%d\n", info->device_name, cmd, rc));
1220 return rc;
1221}
1222#else
1223#define slgt_compat_ioctl NULL
1224#endif /* ifdef CONFIG_COMPAT */
1225
1226/*
1227 * proc fs support
1228 */
1229static inline void line_info(struct seq_file *m, struct slgt_info *info)
1230{
1231 char stat_buf[30];
1232 unsigned long flags;
1233
1234 seq_printf(m, "%s: IO=%08X IRQ=%d MaxFrameSize=%u\n",
1235 info->device_name, info->phys_reg_addr,
1236 info->irq_level, info->max_frame_size);
1237
1238 /* output current serial signal states */
1239 spin_lock_irqsave(&info->lock,flags);
1240 get_signals(info);
1241 spin_unlock_irqrestore(&info->lock,flags);
1242
1243 stat_buf[0] = 0;
1244 stat_buf[1] = 0;
1245 if (info->signals & SerialSignal_RTS)
1246 strcat(stat_buf, "|RTS");
1247 if (info->signals & SerialSignal_CTS)
1248 strcat(stat_buf, "|CTS");
1249 if (info->signals & SerialSignal_DTR)
1250 strcat(stat_buf, "|DTR");
1251 if (info->signals & SerialSignal_DSR)
1252 strcat(stat_buf, "|DSR");
1253 if (info->signals & SerialSignal_DCD)
1254 strcat(stat_buf, "|CD");
1255 if (info->signals & SerialSignal_RI)
1256 strcat(stat_buf, "|RI");
1257
1258 if (info->params.mode != MGSL_MODE_ASYNC) {
1259 seq_printf(m, "\tHDLC txok:%d rxok:%d",
1260 info->icount.txok, info->icount.rxok);
1261 if (info->icount.txunder)
1262 seq_printf(m, " txunder:%d", info->icount.txunder);
1263 if (info->icount.txabort)
1264 seq_printf(m, " txabort:%d", info->icount.txabort);
1265 if (info->icount.rxshort)
1266 seq_printf(m, " rxshort:%d", info->icount.rxshort);
1267 if (info->icount.rxlong)
1268 seq_printf(m, " rxlong:%d", info->icount.rxlong);
1269 if (info->icount.rxover)
1270 seq_printf(m, " rxover:%d", info->icount.rxover);
1271 if (info->icount.rxcrc)
1272 seq_printf(m, " rxcrc:%d", info->icount.rxcrc);
1273 } else {
1274 seq_printf(m, "\tASYNC tx:%d rx:%d",
1275 info->icount.tx, info->icount.rx);
1276 if (info->icount.frame)
1277 seq_printf(m, " fe:%d", info->icount.frame);
1278 if (info->icount.parity)
1279 seq_printf(m, " pe:%d", info->icount.parity);
1280 if (info->icount.brk)
1281 seq_printf(m, " brk:%d", info->icount.brk);
1282 if (info->icount.overrun)
1283 seq_printf(m, " oe:%d", info->icount.overrun);
1284 }
1285
1286 /* Append serial signal status to end */
1287 seq_printf(m, " %s\n", stat_buf+1);
1288
1289 seq_printf(m, "\ttxactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
1290 info->tx_active,info->bh_requested,info->bh_running,
1291 info->pending_bh);
1292}
1293
1294/* Called to print information about devices
1295 */
1296static int synclink_gt_proc_show(struct seq_file *m, void *v)
1297{
1298 struct slgt_info *info;
1299
1300 seq_puts(m, "synclink_gt driver\n");
1301
1302 info = slgt_device_list;
1303 while( info ) {
1304 line_info(m, info);
1305 info = info->next_device;
1306 }
1307 return 0;
1308}
1309
1310/*
1311 * return count of bytes in transmit buffer
1312 */
1313static int chars_in_buffer(struct tty_struct *tty)
1314{
1315 struct slgt_info *info = tty->driver_data;
1316 int count;
1317 if (sanity_check(info, tty->name, "chars_in_buffer"))
1318 return 0;
1319 count = tbuf_bytes(info);
1320 DBGINFO(("%s chars_in_buffer()=%d\n", info->device_name, count));
1321 return count;
1322}
1323
1324/*
1325 * signal remote device to throttle send data (our receive data)
1326 */
1327static void throttle(struct tty_struct * tty)
1328{
1329 struct slgt_info *info = tty->driver_data;
1330 unsigned long flags;
1331
1332 if (sanity_check(info, tty->name, "throttle"))
1333 return;
1334 DBGINFO(("%s throttle\n", info->device_name));
1335 if (I_IXOFF(tty))
1336 send_xchar(tty, STOP_CHAR(tty));
1337 if (C_CRTSCTS(tty)) {
1338 spin_lock_irqsave(&info->lock,flags);
1339 info->signals &= ~SerialSignal_RTS;
1340 set_signals(info);
1341 spin_unlock_irqrestore(&info->lock,flags);
1342 }
1343}
1344
1345/*
1346 * signal remote device to stop throttling send data (our receive data)
1347 */
1348static void unthrottle(struct tty_struct * tty)
1349{
1350 struct slgt_info *info = tty->driver_data;
1351 unsigned long flags;
1352
1353 if (sanity_check(info, tty->name, "unthrottle"))
1354 return;
1355 DBGINFO(("%s unthrottle\n", info->device_name));
1356 if (I_IXOFF(tty)) {
1357 if (info->x_char)
1358 info->x_char = 0;
1359 else
1360 send_xchar(tty, START_CHAR(tty));
1361 }
1362 if (C_CRTSCTS(tty)) {
1363 spin_lock_irqsave(&info->lock,flags);
1364 info->signals |= SerialSignal_RTS;
1365 set_signals(info);
1366 spin_unlock_irqrestore(&info->lock,flags);
1367 }
1368}
1369
1370/*
1371 * set or clear transmit break condition
1372 * break_state -1=set break condition, 0=clear
1373 */
1374static int set_break(struct tty_struct *tty, int break_state)
1375{
1376 struct slgt_info *info = tty->driver_data;
1377 unsigned short value;
1378 unsigned long flags;
1379
1380 if (sanity_check(info, tty->name, "set_break"))
1381 return -EINVAL;
1382 DBGINFO(("%s set_break(%d)\n", info->device_name, break_state));
1383
1384 spin_lock_irqsave(&info->lock,flags);
1385 value = rd_reg16(info, TCR);
1386 if (break_state == -1)
1387 value |= BIT6;
1388 else
1389 value &= ~BIT6;
1390 wr_reg16(info, TCR, value);
1391 spin_unlock_irqrestore(&info->lock,flags);
1392 return 0;
1393}
1394
1395#if SYNCLINK_GENERIC_HDLC
1396
1397/**
1398 * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
1399 * set encoding and frame check sequence (FCS) options
1400 *
1401 * dev pointer to network device structure
1402 * encoding serial encoding setting
1403 * parity FCS setting
1404 *
1405 * returns 0 if success, otherwise error code
1406 */
1407static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
1408 unsigned short parity)
1409{
1410 struct slgt_info *info = dev_to_port(dev);
1411 unsigned char new_encoding;
1412 unsigned short new_crctype;
1413
1414 /* return error if TTY interface open */
1415 if (info->port.count)
1416 return -EBUSY;
1417
1418 DBGINFO(("%s hdlcdev_attach\n", info->device_name));
1419
1420 switch (encoding)
1421 {
1422 case ENCODING_NRZ: new_encoding = HDLC_ENCODING_NRZ; break;
1423 case ENCODING_NRZI: new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
1424 case ENCODING_FM_MARK: new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
1425 case ENCODING_FM_SPACE: new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
1426 case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
1427 default: return -EINVAL;
1428 }
1429
1430 switch (parity)
1431 {
1432 case PARITY_NONE: new_crctype = HDLC_CRC_NONE; break;
1433 case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
1434 case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
1435 default: return -EINVAL;
1436 }
1437
1438 info->params.encoding = new_encoding;
1439 info->params.crc_type = new_crctype;
1440
1441 /* if network interface up, reprogram hardware */
1442 if (info->netcount)
1443 program_hw(info);
1444
1445 return 0;
1446}
1447
1448/**
1449 * called by generic HDLC layer to send frame
1450 *
1451 * skb socket buffer containing HDLC frame
1452 * dev pointer to network device structure
1453 */
1454static netdev_tx_t hdlcdev_xmit(struct sk_buff *skb,
1455 struct net_device *dev)
1456{
1457 struct slgt_info *info = dev_to_port(dev);
1458 unsigned long flags;
1459
1460 DBGINFO(("%s hdlc_xmit\n", dev->name));
1461
1462 if (!skb->len)
1463 return NETDEV_TX_OK;
1464
1465 /* stop sending until this frame completes */
1466 netif_stop_queue(dev);
1467
1468 /* update network statistics */
1469 dev->stats.tx_packets++;
1470 dev->stats.tx_bytes += skb->len;
1471
1472 /* save start time for transmit timeout detection */
1473 netif_trans_update(dev);
1474
1475 spin_lock_irqsave(&info->lock, flags);
1476 tx_load(info, skb->data, skb->len);
1477 spin_unlock_irqrestore(&info->lock, flags);
1478
1479 /* done with socket buffer, so free it */
1480 dev_kfree_skb(skb);
1481
1482 return NETDEV_TX_OK;
1483}
1484
1485/**
1486 * called by network layer when interface enabled
1487 * claim resources and initialize hardware
1488 *
1489 * dev pointer to network device structure
1490 *
1491 * returns 0 if success, otherwise error code
1492 */
1493static int hdlcdev_open(struct net_device *dev)
1494{
1495 struct slgt_info *info = dev_to_port(dev);
1496 int rc;
1497 unsigned long flags;
1498
1499 if (!try_module_get(THIS_MODULE))
1500 return -EBUSY;
1501
1502 DBGINFO(("%s hdlcdev_open\n", dev->name));
1503
1504 /* generic HDLC layer open processing */
1505 rc = hdlc_open(dev);
1506 if (rc)
1507 return rc;
1508
1509 /* arbitrate between network and tty opens */
1510 spin_lock_irqsave(&info->netlock, flags);
1511 if (info->port.count != 0 || info->netcount != 0) {
1512 DBGINFO(("%s hdlc_open busy\n", dev->name));
1513 spin_unlock_irqrestore(&info->netlock, flags);
1514 return -EBUSY;
1515 }
1516 info->netcount=1;
1517 spin_unlock_irqrestore(&info->netlock, flags);
1518
1519 /* claim resources and init adapter */
1520 if ((rc = startup(info)) != 0) {
1521 spin_lock_irqsave(&info->netlock, flags);
1522 info->netcount=0;
1523 spin_unlock_irqrestore(&info->netlock, flags);
1524 return rc;
1525 }
1526
1527 /* assert RTS and DTR, apply hardware settings */
1528 info->signals |= SerialSignal_RTS | SerialSignal_DTR;
1529 program_hw(info);
1530
1531 /* enable network layer transmit */
1532 netif_trans_update(dev);
1533 netif_start_queue(dev);
1534
1535 /* inform generic HDLC layer of current DCD status */
1536 spin_lock_irqsave(&info->lock, flags);
1537 get_signals(info);
1538 spin_unlock_irqrestore(&info->lock, flags);
1539 if (info->signals & SerialSignal_DCD)
1540 netif_carrier_on(dev);
1541 else
1542 netif_carrier_off(dev);
1543 return 0;
1544}
1545
1546/**
1547 * called by network layer when interface is disabled
1548 * shutdown hardware and release resources
1549 *
1550 * dev pointer to network device structure
1551 *
1552 * returns 0 if success, otherwise error code
1553 */
1554static int hdlcdev_close(struct net_device *dev)
1555{
1556 struct slgt_info *info = dev_to_port(dev);
1557 unsigned long flags;
1558
1559 DBGINFO(("%s hdlcdev_close\n", dev->name));
1560
1561 netif_stop_queue(dev);
1562
1563 /* shutdown adapter and release resources */
1564 shutdown(info);
1565
1566 hdlc_close(dev);
1567
1568 spin_lock_irqsave(&info->netlock, flags);
1569 info->netcount=0;
1570 spin_unlock_irqrestore(&info->netlock, flags);
1571
1572 module_put(THIS_MODULE);
1573 return 0;
1574}
1575
1576/**
1577 * called by network layer to process IOCTL call to network device
1578 *
1579 * dev pointer to network device structure
1580 * ifr pointer to network interface request structure
1581 * cmd IOCTL command code
1582 *
1583 * returns 0 if success, otherwise error code
1584 */
1585static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1586{
1587 const size_t size = sizeof(sync_serial_settings);
1588 sync_serial_settings new_line;
1589 sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
1590 struct slgt_info *info = dev_to_port(dev);
1591 unsigned int flags;
1592
1593 DBGINFO(("%s hdlcdev_ioctl\n", dev->name));
1594
1595 /* return error if TTY interface open */
1596 if (info->port.count)
1597 return -EBUSY;
1598
1599 if (cmd != SIOCWANDEV)
1600 return hdlc_ioctl(dev, ifr, cmd);
1601
1602 memset(&new_line, 0, sizeof(new_line));
1603
1604 switch(ifr->ifr_settings.type) {
1605 case IF_GET_IFACE: /* return current sync_serial_settings */
1606
1607 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
1608 if (ifr->ifr_settings.size < size) {
1609 ifr->ifr_settings.size = size; /* data size wanted */
1610 return -ENOBUFS;
1611 }
1612
1613 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1614 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
1615 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1616 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
1617
1618 switch (flags){
1619 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
1620 case (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_INT; break;
1621 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_TXINT; break;
1622 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
1623 default: new_line.clock_type = CLOCK_DEFAULT;
1624 }
1625
1626 new_line.clock_rate = info->params.clock_speed;
1627 new_line.loopback = info->params.loopback ? 1:0;
1628
1629 if (copy_to_user(line, &new_line, size))
1630 return -EFAULT;
1631 return 0;
1632
1633 case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
1634
1635 if(!capable(CAP_NET_ADMIN))
1636 return -EPERM;
1637 if (copy_from_user(&new_line, line, size))
1638 return -EFAULT;
1639
1640 switch (new_line.clock_type)
1641 {
1642 case CLOCK_EXT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
1643 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
1644 case CLOCK_INT: flags = HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG; break;
1645 case CLOCK_TXINT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG; break;
1646 case CLOCK_DEFAULT: flags = info->params.flags &
1647 (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1648 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
1649 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1650 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN); break;
1651 default: return -EINVAL;
1652 }
1653
1654 if (new_line.loopback != 0 && new_line.loopback != 1)
1655 return -EINVAL;
1656
1657 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1658 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
1659 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1660 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
1661 info->params.flags |= flags;
1662
1663 info->params.loopback = new_line.loopback;
1664
1665 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
1666 info->params.clock_speed = new_line.clock_rate;
1667 else
1668 info->params.clock_speed = 0;
1669
1670 /* if network interface up, reprogram hardware */
1671 if (info->netcount)
1672 program_hw(info);
1673 return 0;
1674
1675 default:
1676 return hdlc_ioctl(dev, ifr, cmd);
1677 }
1678}
1679
1680/**
1681 * called by network layer when transmit timeout is detected
1682 *
1683 * dev pointer to network device structure
1684 */
1685static void hdlcdev_tx_timeout(struct net_device *dev)
1686{
1687 struct slgt_info *info = dev_to_port(dev);
1688 unsigned long flags;
1689
1690 DBGINFO(("%s hdlcdev_tx_timeout\n", dev->name));
1691
1692 dev->stats.tx_errors++;
1693 dev->stats.tx_aborted_errors++;
1694
1695 spin_lock_irqsave(&info->lock,flags);
1696 tx_stop(info);
1697 spin_unlock_irqrestore(&info->lock,flags);
1698
1699 netif_wake_queue(dev);
1700}
1701
1702/**
1703 * called by device driver when transmit completes
1704 * reenable network layer transmit if stopped
1705 *
1706 * info pointer to device instance information
1707 */
1708static void hdlcdev_tx_done(struct slgt_info *info)
1709{
1710 if (netif_queue_stopped(info->netdev))
1711 netif_wake_queue(info->netdev);
1712}
1713
1714/**
1715 * called by device driver when frame received
1716 * pass frame to network layer
1717 *
1718 * info pointer to device instance information
1719 * buf pointer to buffer contianing frame data
1720 * size count of data bytes in buf
1721 */
1722static void hdlcdev_rx(struct slgt_info *info, char *buf, int size)
1723{
1724 struct sk_buff *skb = dev_alloc_skb(size);
1725 struct net_device *dev = info->netdev;
1726
1727 DBGINFO(("%s hdlcdev_rx\n", dev->name));
1728
1729 if (skb == NULL) {
1730 DBGERR(("%s: can't alloc skb, drop packet\n", dev->name));
1731 dev->stats.rx_dropped++;
1732 return;
1733 }
1734
1735 skb_put_data(skb, buf, size);
1736
1737 skb->protocol = hdlc_type_trans(skb, dev);
1738
1739 dev->stats.rx_packets++;
1740 dev->stats.rx_bytes += size;
1741
1742 netif_rx(skb);
1743}
1744
1745static const struct net_device_ops hdlcdev_ops = {
1746 .ndo_open = hdlcdev_open,
1747 .ndo_stop = hdlcdev_close,
1748 .ndo_start_xmit = hdlc_start_xmit,
1749 .ndo_do_ioctl = hdlcdev_ioctl,
1750 .ndo_tx_timeout = hdlcdev_tx_timeout,
1751};
1752
1753/**
1754 * called by device driver when adding device instance
1755 * do generic HDLC initialization
1756 *
1757 * info pointer to device instance information
1758 *
1759 * returns 0 if success, otherwise error code
1760 */
1761static int hdlcdev_init(struct slgt_info *info)
1762{
1763 int rc;
1764 struct net_device *dev;
1765 hdlc_device *hdlc;
1766
1767 /* allocate and initialize network and HDLC layer objects */
1768
1769 dev = alloc_hdlcdev(info);
1770 if (!dev) {
1771 printk(KERN_ERR "%s hdlc device alloc failure\n", info->device_name);
1772 return -ENOMEM;
1773 }
1774
1775 /* for network layer reporting purposes only */
1776 dev->mem_start = info->phys_reg_addr;
1777 dev->mem_end = info->phys_reg_addr + SLGT_REG_SIZE - 1;
1778 dev->irq = info->irq_level;
1779
1780 /* network layer callbacks and settings */
1781 dev->netdev_ops = &hdlcdev_ops;
1782 dev->watchdog_timeo = 10 * HZ;
1783 dev->tx_queue_len = 50;
1784
1785 /* generic HDLC layer callbacks and settings */
1786 hdlc = dev_to_hdlc(dev);
1787 hdlc->attach = hdlcdev_attach;
1788 hdlc->xmit = hdlcdev_xmit;
1789
1790 /* register objects with HDLC layer */
1791 rc = register_hdlc_device(dev);
1792 if (rc) {
1793 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
1794 free_netdev(dev);
1795 return rc;
1796 }
1797
1798 info->netdev = dev;
1799 return 0;
1800}
1801
1802/**
1803 * called by device driver when removing device instance
1804 * do generic HDLC cleanup
1805 *
1806 * info pointer to device instance information
1807 */
1808static void hdlcdev_exit(struct slgt_info *info)
1809{
1810 unregister_hdlc_device(info->netdev);
1811 free_netdev(info->netdev);
1812 info->netdev = NULL;
1813}
1814
1815#endif /* ifdef CONFIG_HDLC */
1816
1817/*
1818 * get async data from rx DMA buffers
1819 */
1820static void rx_async(struct slgt_info *info)
1821{
1822 struct mgsl_icount *icount = &info->icount;
1823 unsigned int start, end;
1824 unsigned char *p;
1825 unsigned char status;
1826 struct slgt_desc *bufs = info->rbufs;
1827 int i, count;
1828 int chars = 0;
1829 int stat;
1830 unsigned char ch;
1831
1832 start = end = info->rbuf_current;
1833
1834 while(desc_complete(bufs[end])) {
1835 count = desc_count(bufs[end]) - info->rbuf_index;
1836 p = bufs[end].buf + info->rbuf_index;
1837
1838 DBGISR(("%s rx_async count=%d\n", info->device_name, count));
1839 DBGDATA(info, p, count, "rx");
1840
1841 for(i=0 ; i < count; i+=2, p+=2) {
1842 ch = *p;
1843 icount->rx++;
1844
1845 stat = 0;
1846
1847 status = *(p + 1) & (BIT1 + BIT0);
1848 if (status) {
1849 if (status & BIT1)
1850 icount->parity++;
1851 else if (status & BIT0)
1852 icount->frame++;
1853 /* discard char if tty control flags say so */
1854 if (status & info->ignore_status_mask)
1855 continue;
1856 if (status & BIT1)
1857 stat = TTY_PARITY;
1858 else if (status & BIT0)
1859 stat = TTY_FRAME;
1860 }
1861 tty_insert_flip_char(&info->port, ch, stat);
1862 chars++;
1863 }
1864
1865 if (i < count) {
1866 /* receive buffer not completed */
1867 info->rbuf_index += i;
1868 mod_timer(&info->rx_timer, jiffies + 1);
1869 break;
1870 }
1871
1872 info->rbuf_index = 0;
1873 free_rbufs(info, end, end);
1874
1875 if (++end == info->rbuf_count)
1876 end = 0;
1877
1878 /* if entire list searched then no frame available */
1879 if (end == start)
1880 break;
1881 }
1882
1883 if (chars)
1884 tty_flip_buffer_push(&info->port);
1885}
1886
1887/*
1888 * return next bottom half action to perform
1889 */
1890static int bh_action(struct slgt_info *info)
1891{
1892 unsigned long flags;
1893 int rc;
1894
1895 spin_lock_irqsave(&info->lock,flags);
1896
1897 if (info->pending_bh & BH_RECEIVE) {
1898 info->pending_bh &= ~BH_RECEIVE;
1899 rc = BH_RECEIVE;
1900 } else if (info->pending_bh & BH_TRANSMIT) {
1901 info->pending_bh &= ~BH_TRANSMIT;
1902 rc = BH_TRANSMIT;
1903 } else if (info->pending_bh & BH_STATUS) {
1904 info->pending_bh &= ~BH_STATUS;
1905 rc = BH_STATUS;
1906 } else {
1907 /* Mark BH routine as complete */
1908 info->bh_running = false;
1909 info->bh_requested = false;
1910 rc = 0;
1911 }
1912
1913 spin_unlock_irqrestore(&info->lock,flags);
1914
1915 return rc;
1916}
1917
1918/*
1919 * perform bottom half processing
1920 */
1921static void bh_handler(struct work_struct *work)
1922{
1923 struct slgt_info *info = container_of(work, struct slgt_info, task);
1924 int action;
1925
1926 info->bh_running = true;
1927
1928 while((action = bh_action(info))) {
1929 switch (action) {
1930 case BH_RECEIVE:
1931 DBGBH(("%s bh receive\n", info->device_name));
1932 switch(info->params.mode) {
1933 case MGSL_MODE_ASYNC:
1934 rx_async(info);
1935 break;
1936 case MGSL_MODE_HDLC:
1937 while(rx_get_frame(info));
1938 break;
1939 case MGSL_MODE_RAW:
1940 case MGSL_MODE_MONOSYNC:
1941 case MGSL_MODE_BISYNC:
1942 case MGSL_MODE_XSYNC:
1943 while(rx_get_buf(info));
1944 break;
1945 }
1946 /* restart receiver if rx DMA buffers exhausted */
1947 if (info->rx_restart)
1948 rx_start(info);
1949 break;
1950 case BH_TRANSMIT:
1951 bh_transmit(info);
1952 break;
1953 case BH_STATUS:
1954 DBGBH(("%s bh status\n", info->device_name));
1955 info->ri_chkcount = 0;
1956 info->dsr_chkcount = 0;
1957 info->dcd_chkcount = 0;
1958 info->cts_chkcount = 0;
1959 break;
1960 default:
1961 DBGBH(("%s unknown action\n", info->device_name));
1962 break;
1963 }
1964 }
1965 DBGBH(("%s bh_handler exit\n", info->device_name));
1966}
1967
1968static void bh_transmit(struct slgt_info *info)
1969{
1970 struct tty_struct *tty = info->port.tty;
1971
1972 DBGBH(("%s bh_transmit\n", info->device_name));
1973 if (tty)
1974 tty_wakeup(tty);
1975}
1976
1977static void dsr_change(struct slgt_info *info, unsigned short status)
1978{
1979 if (status & BIT3) {
1980 info->signals |= SerialSignal_DSR;
1981 info->input_signal_events.dsr_up++;
1982 } else {
1983 info->signals &= ~SerialSignal_DSR;
1984 info->input_signal_events.dsr_down++;
1985 }
1986 DBGISR(("dsr_change %s signals=%04X\n", info->device_name, info->signals));
1987 if ((info->dsr_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
1988 slgt_irq_off(info, IRQ_DSR);
1989 return;
1990 }
1991 info->icount.dsr++;
1992 wake_up_interruptible(&info->status_event_wait_q);
1993 wake_up_interruptible(&info->event_wait_q);
1994 info->pending_bh |= BH_STATUS;
1995}
1996
1997static void cts_change(struct slgt_info *info, unsigned short status)
1998{
1999 if (status & BIT2) {
2000 info->signals |= SerialSignal_CTS;
2001 info->input_signal_events.cts_up++;
2002 } else {
2003 info->signals &= ~SerialSignal_CTS;
2004 info->input_signal_events.cts_down++;
2005 }
2006 DBGISR(("cts_change %s signals=%04X\n", info->device_name, info->signals));
2007 if ((info->cts_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2008 slgt_irq_off(info, IRQ_CTS);
2009 return;
2010 }
2011 info->icount.cts++;
2012 wake_up_interruptible(&info->status_event_wait_q);
2013 wake_up_interruptible(&info->event_wait_q);
2014 info->pending_bh |= BH_STATUS;
2015
2016 if (tty_port_cts_enabled(&info->port)) {
2017 if (info->port.tty) {
2018 if (info->port.tty->hw_stopped) {
2019 if (info->signals & SerialSignal_CTS) {
2020 info->port.tty->hw_stopped = 0;
2021 info->pending_bh |= BH_TRANSMIT;
2022 return;
2023 }
2024 } else {
2025 if (!(info->signals & SerialSignal_CTS))
2026 info->port.tty->hw_stopped = 1;
2027 }
2028 }
2029 }
2030}
2031
2032static void dcd_change(struct slgt_info *info, unsigned short status)
2033{
2034 if (status & BIT1) {
2035 info->signals |= SerialSignal_DCD;
2036 info->input_signal_events.dcd_up++;
2037 } else {
2038 info->signals &= ~SerialSignal_DCD;
2039 info->input_signal_events.dcd_down++;
2040 }
2041 DBGISR(("dcd_change %s signals=%04X\n", info->device_name, info->signals));
2042 if ((info->dcd_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2043 slgt_irq_off(info, IRQ_DCD);
2044 return;
2045 }
2046 info->icount.dcd++;
2047#if SYNCLINK_GENERIC_HDLC
2048 if (info->netcount) {
2049 if (info->signals & SerialSignal_DCD)
2050 netif_carrier_on(info->netdev);
2051 else
2052 netif_carrier_off(info->netdev);
2053 }
2054#endif
2055 wake_up_interruptible(&info->status_event_wait_q);
2056 wake_up_interruptible(&info->event_wait_q);
2057 info->pending_bh |= BH_STATUS;
2058
2059 if (tty_port_check_carrier(&info->port)) {
2060 if (info->signals & SerialSignal_DCD)
2061 wake_up_interruptible(&info->port.open_wait);
2062 else {
2063 if (info->port.tty)
2064 tty_hangup(info->port.tty);
2065 }
2066 }
2067}
2068
2069static void ri_change(struct slgt_info *info, unsigned short status)
2070{
2071 if (status & BIT0) {
2072 info->signals |= SerialSignal_RI;
2073 info->input_signal_events.ri_up++;
2074 } else {
2075 info->signals &= ~SerialSignal_RI;
2076 info->input_signal_events.ri_down++;
2077 }
2078 DBGISR(("ri_change %s signals=%04X\n", info->device_name, info->signals));
2079 if ((info->ri_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2080 slgt_irq_off(info, IRQ_RI);
2081 return;
2082 }
2083 info->icount.rng++;
2084 wake_up_interruptible(&info->status_event_wait_q);
2085 wake_up_interruptible(&info->event_wait_q);
2086 info->pending_bh |= BH_STATUS;
2087}
2088
2089static void isr_rxdata(struct slgt_info *info)
2090{
2091 unsigned int count = info->rbuf_fill_count;
2092 unsigned int i = info->rbuf_fill_index;
2093 unsigned short reg;
2094
2095 while (rd_reg16(info, SSR) & IRQ_RXDATA) {
2096 reg = rd_reg16(info, RDR);
2097 DBGISR(("isr_rxdata %s RDR=%04X\n", info->device_name, reg));
2098 if (desc_complete(info->rbufs[i])) {
2099 /* all buffers full */
2100 rx_stop(info);
2101 info->rx_restart = 1;
2102 continue;
2103 }
2104 info->rbufs[i].buf[count++] = (unsigned char)reg;
2105 /* async mode saves status byte to buffer for each data byte */
2106 if (info->params.mode == MGSL_MODE_ASYNC)
2107 info->rbufs[i].buf[count++] = (unsigned char)(reg >> 8);
2108 if (count == info->rbuf_fill_level || (reg & BIT10)) {
2109 /* buffer full or end of frame */
2110 set_desc_count(info->rbufs[i], count);
2111 set_desc_status(info->rbufs[i], BIT15 | (reg >> 8));
2112 info->rbuf_fill_count = count = 0;
2113 if (++i == info->rbuf_count)
2114 i = 0;
2115 info->pending_bh |= BH_RECEIVE;
2116 }
2117 }
2118
2119 info->rbuf_fill_index = i;
2120 info->rbuf_fill_count = count;
2121}
2122
2123static void isr_serial(struct slgt_info *info)
2124{
2125 unsigned short status = rd_reg16(info, SSR);
2126
2127 DBGISR(("%s isr_serial status=%04X\n", info->device_name, status));
2128
2129 wr_reg16(info, SSR, status); /* clear pending */
2130
2131 info->irq_occurred = true;
2132
2133 if (info->params.mode == MGSL_MODE_ASYNC) {
2134 if (status & IRQ_TXIDLE) {
2135 if (info->tx_active)
2136 isr_txeom(info, status);
2137 }
2138 if (info->rx_pio && (status & IRQ_RXDATA))
2139 isr_rxdata(info);
2140 if ((status & IRQ_RXBREAK) && (status & RXBREAK)) {
2141 info->icount.brk++;
2142 /* process break detection if tty control allows */
2143 if (info->port.tty) {
2144 if (!(status & info->ignore_status_mask)) {
2145 if (info->read_status_mask & MASK_BREAK) {
2146 tty_insert_flip_char(&info->port, 0, TTY_BREAK);
2147 if (info->port.flags & ASYNC_SAK)
2148 do_SAK(info->port.tty);
2149 }
2150 }
2151 }
2152 }
2153 } else {
2154 if (status & (IRQ_TXIDLE + IRQ_TXUNDER))
2155 isr_txeom(info, status);
2156 if (info->rx_pio && (status & IRQ_RXDATA))
2157 isr_rxdata(info);
2158 if (status & IRQ_RXIDLE) {
2159 if (status & RXIDLE)
2160 info->icount.rxidle++;
2161 else
2162 info->icount.exithunt++;
2163 wake_up_interruptible(&info->event_wait_q);
2164 }
2165
2166 if (status & IRQ_RXOVER)
2167 rx_start(info);
2168 }
2169
2170 if (status & IRQ_DSR)
2171 dsr_change(info, status);
2172 if (status & IRQ_CTS)
2173 cts_change(info, status);
2174 if (status & IRQ_DCD)
2175 dcd_change(info, status);
2176 if (status & IRQ_RI)
2177 ri_change(info, status);
2178}
2179
2180static void isr_rdma(struct slgt_info *info)
2181{
2182 unsigned int status = rd_reg32(info, RDCSR);
2183
2184 DBGISR(("%s isr_rdma status=%08x\n", info->device_name, status));
2185
2186 /* RDCSR (rx DMA control/status)
2187 *
2188 * 31..07 reserved
2189 * 06 save status byte to DMA buffer
2190 * 05 error
2191 * 04 eol (end of list)
2192 * 03 eob (end of buffer)
2193 * 02 IRQ enable
2194 * 01 reset
2195 * 00 enable
2196 */
2197 wr_reg32(info, RDCSR, status); /* clear pending */
2198
2199 if (status & (BIT5 + BIT4)) {
2200 DBGISR(("%s isr_rdma rx_restart=1\n", info->device_name));
2201 info->rx_restart = true;
2202 }
2203 info->pending_bh |= BH_RECEIVE;
2204}
2205
2206static void isr_tdma(struct slgt_info *info)
2207{
2208 unsigned int status = rd_reg32(info, TDCSR);
2209
2210 DBGISR(("%s isr_tdma status=%08x\n", info->device_name, status));
2211
2212 /* TDCSR (tx DMA control/status)
2213 *
2214 * 31..06 reserved
2215 * 05 error
2216 * 04 eol (end of list)
2217 * 03 eob (end of buffer)
2218 * 02 IRQ enable
2219 * 01 reset
2220 * 00 enable
2221 */
2222 wr_reg32(info, TDCSR, status); /* clear pending */
2223
2224 if (status & (BIT5 + BIT4 + BIT3)) {
2225 // another transmit buffer has completed
2226 // run bottom half to get more send data from user
2227 info->pending_bh |= BH_TRANSMIT;
2228 }
2229}
2230
2231/*
2232 * return true if there are unsent tx DMA buffers, otherwise false
2233 *
2234 * if there are unsent buffers then info->tbuf_start
2235 * is set to index of first unsent buffer
2236 */
2237static bool unsent_tbufs(struct slgt_info *info)
2238{
2239 unsigned int i = info->tbuf_current;
2240 bool rc = false;
2241
2242 /*
2243 * search backwards from last loaded buffer (precedes tbuf_current)
2244 * for first unsent buffer (desc_count > 0)
2245 */
2246
2247 do {
2248 if (i)
2249 i--;
2250 else
2251 i = info->tbuf_count - 1;
2252 if (!desc_count(info->tbufs[i]))
2253 break;
2254 info->tbuf_start = i;
2255 rc = true;
2256 } while (i != info->tbuf_current);
2257
2258 return rc;
2259}
2260
2261static void isr_txeom(struct slgt_info *info, unsigned short status)
2262{
2263 DBGISR(("%s txeom status=%04x\n", info->device_name, status));
2264
2265 slgt_irq_off(info, IRQ_TXDATA + IRQ_TXIDLE + IRQ_TXUNDER);
2266 tdma_reset(info);
2267 if (status & IRQ_TXUNDER) {
2268 unsigned short val = rd_reg16(info, TCR);
2269 wr_reg16(info, TCR, (unsigned short)(val | BIT2)); /* set reset bit */
2270 wr_reg16(info, TCR, val); /* clear reset bit */
2271 }
2272
2273 if (info->tx_active) {
2274 if (info->params.mode != MGSL_MODE_ASYNC) {
2275 if (status & IRQ_TXUNDER)
2276 info->icount.txunder++;
2277 else if (status & IRQ_TXIDLE)
2278 info->icount.txok++;
2279 }
2280
2281 if (unsent_tbufs(info)) {
2282 tx_start(info);
2283 update_tx_timer(info);
2284 return;
2285 }
2286 info->tx_active = false;
2287
2288 del_timer(&info->tx_timer);
2289
2290 if (info->params.mode != MGSL_MODE_ASYNC && info->drop_rts_on_tx_done) {
2291 info->signals &= ~SerialSignal_RTS;
2292 info->drop_rts_on_tx_done = false;
2293 set_signals(info);
2294 }
2295
2296#if SYNCLINK_GENERIC_HDLC
2297 if (info->netcount)
2298 hdlcdev_tx_done(info);
2299 else
2300#endif
2301 {
2302 if (info->port.tty && (info->port.tty->stopped || info->port.tty->hw_stopped)) {
2303 tx_stop(info);
2304 return;
2305 }
2306 info->pending_bh |= BH_TRANSMIT;
2307 }
2308 }
2309}
2310
2311static void isr_gpio(struct slgt_info *info, unsigned int changed, unsigned int state)
2312{
2313 struct cond_wait *w, *prev;
2314
2315 /* wake processes waiting for specific transitions */
2316 for (w = info->gpio_wait_q, prev = NULL ; w != NULL ; w = w->next) {
2317 if (w->data & changed) {
2318 w->data = state;
2319 wake_up_interruptible(&w->q);
2320 if (prev != NULL)
2321 prev->next = w->next;
2322 else
2323 info->gpio_wait_q = w->next;
2324 } else
2325 prev = w;
2326 }
2327}
2328
2329/* interrupt service routine
2330 *
2331 * irq interrupt number
2332 * dev_id device ID supplied during interrupt registration
2333 */
2334static irqreturn_t slgt_interrupt(int dummy, void *dev_id)
2335{
2336 struct slgt_info *info = dev_id;
2337 unsigned int gsr;
2338 unsigned int i;
2339
2340 DBGISR(("slgt_interrupt irq=%d entry\n", info->irq_level));
2341
2342 while((gsr = rd_reg32(info, GSR) & 0xffffff00)) {
2343 DBGISR(("%s gsr=%08x\n", info->device_name, gsr));
2344 info->irq_occurred = true;
2345 for(i=0; i < info->port_count ; i++) {
2346 if (info->port_array[i] == NULL)
2347 continue;
2348 spin_lock(&info->port_array[i]->lock);
2349 if (gsr & (BIT8 << i))
2350 isr_serial(info->port_array[i]);
2351 if (gsr & (BIT16 << (i*2)))
2352 isr_rdma(info->port_array[i]);
2353 if (gsr & (BIT17 << (i*2)))
2354 isr_tdma(info->port_array[i]);
2355 spin_unlock(&info->port_array[i]->lock);
2356 }
2357 }
2358
2359 if (info->gpio_present) {
2360 unsigned int state;
2361 unsigned int changed;
2362 spin_lock(&info->lock);
2363 while ((changed = rd_reg32(info, IOSR)) != 0) {
2364 DBGISR(("%s iosr=%08x\n", info->device_name, changed));
2365 /* read latched state of GPIO signals */
2366 state = rd_reg32(info, IOVR);
2367 /* clear pending GPIO interrupt bits */
2368 wr_reg32(info, IOSR, changed);
2369 for (i=0 ; i < info->port_count ; i++) {
2370 if (info->port_array[i] != NULL)
2371 isr_gpio(info->port_array[i], changed, state);
2372 }
2373 }
2374 spin_unlock(&info->lock);
2375 }
2376
2377 for(i=0; i < info->port_count ; i++) {
2378 struct slgt_info *port = info->port_array[i];
2379 if (port == NULL)
2380 continue;
2381 spin_lock(&port->lock);
2382 if ((port->port.count || port->netcount) &&
2383 port->pending_bh && !port->bh_running &&
2384 !port->bh_requested) {
2385 DBGISR(("%s bh queued\n", port->device_name));
2386 schedule_work(&port->task);
2387 port->bh_requested = true;
2388 }
2389 spin_unlock(&port->lock);
2390 }
2391
2392 DBGISR(("slgt_interrupt irq=%d exit\n", info->irq_level));
2393 return IRQ_HANDLED;
2394}
2395
2396static int startup(struct slgt_info *info)
2397{
2398 DBGINFO(("%s startup\n", info->device_name));
2399
2400 if (tty_port_initialized(&info->port))
2401 return 0;
2402
2403 if (!info->tx_buf) {
2404 info->tx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
2405 if (!info->tx_buf) {
2406 DBGERR(("%s can't allocate tx buffer\n", info->device_name));
2407 return -ENOMEM;
2408 }
2409 }
2410
2411 info->pending_bh = 0;
2412
2413 memset(&info->icount, 0, sizeof(info->icount));
2414
2415 /* program hardware for current parameters */
2416 change_params(info);
2417
2418 if (info->port.tty)
2419 clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
2420
2421 tty_port_set_initialized(&info->port, 1);
2422
2423 return 0;
2424}
2425
2426/*
2427 * called by close() and hangup() to shutdown hardware
2428 */
2429static void shutdown(struct slgt_info *info)
2430{
2431 unsigned long flags;
2432
2433 if (!tty_port_initialized(&info->port))
2434 return;
2435
2436 DBGINFO(("%s shutdown\n", info->device_name));
2437
2438 /* clear status wait queue because status changes */
2439 /* can't happen after shutting down the hardware */
2440 wake_up_interruptible(&info->status_event_wait_q);
2441 wake_up_interruptible(&info->event_wait_q);
2442
2443 del_timer_sync(&info->tx_timer);
2444 del_timer_sync(&info->rx_timer);
2445
2446 kfree(info->tx_buf);
2447 info->tx_buf = NULL;
2448
2449 spin_lock_irqsave(&info->lock,flags);
2450
2451 tx_stop(info);
2452 rx_stop(info);
2453
2454 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
2455
2456 if (!info->port.tty || info->port.tty->termios.c_cflag & HUPCL) {
2457 info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
2458 set_signals(info);
2459 }
2460
2461 flush_cond_wait(&info->gpio_wait_q);
2462
2463 spin_unlock_irqrestore(&info->lock,flags);
2464
2465 if (info->port.tty)
2466 set_bit(TTY_IO_ERROR, &info->port.tty->flags);
2467
2468 tty_port_set_initialized(&info->port, 0);
2469}
2470
2471static void program_hw(struct slgt_info *info)
2472{
2473 unsigned long flags;
2474
2475 spin_lock_irqsave(&info->lock,flags);
2476
2477 rx_stop(info);
2478 tx_stop(info);
2479
2480 if (info->params.mode != MGSL_MODE_ASYNC ||
2481 info->netcount)
2482 sync_mode(info);
2483 else
2484 async_mode(info);
2485
2486 set_signals(info);
2487
2488 info->dcd_chkcount = 0;
2489 info->cts_chkcount = 0;
2490 info->ri_chkcount = 0;
2491 info->dsr_chkcount = 0;
2492
2493 slgt_irq_on(info, IRQ_DCD | IRQ_CTS | IRQ_DSR | IRQ_RI);
2494 get_signals(info);
2495
2496 if (info->netcount ||
2497 (info->port.tty && info->port.tty->termios.c_cflag & CREAD))
2498 rx_start(info);
2499
2500 spin_unlock_irqrestore(&info->lock,flags);
2501}
2502
2503/*
2504 * reconfigure adapter based on new parameters
2505 */
2506static void change_params(struct slgt_info *info)
2507{
2508 unsigned cflag;
2509 int bits_per_char;
2510
2511 if (!info->port.tty)
2512 return;
2513 DBGINFO(("%s change_params\n", info->device_name));
2514
2515 cflag = info->port.tty->termios.c_cflag;
2516
2517 /* if B0 rate (hangup) specified then negate RTS and DTR */
2518 /* otherwise assert RTS and DTR */
2519 if (cflag & CBAUD)
2520 info->signals |= SerialSignal_RTS | SerialSignal_DTR;
2521 else
2522 info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
2523
2524 /* byte size and parity */
2525
2526 switch (cflag & CSIZE) {
2527 case CS5: info->params.data_bits = 5; break;
2528 case CS6: info->params.data_bits = 6; break;
2529 case CS7: info->params.data_bits = 7; break;
2530 case CS8: info->params.data_bits = 8; break;
2531 default: info->params.data_bits = 7; break;
2532 }
2533
2534 info->params.stop_bits = (cflag & CSTOPB) ? 2 : 1;
2535
2536 if (cflag & PARENB)
2537 info->params.parity = (cflag & PARODD) ? ASYNC_PARITY_ODD : ASYNC_PARITY_EVEN;
2538 else
2539 info->params.parity = ASYNC_PARITY_NONE;
2540
2541 /* calculate number of jiffies to transmit a full
2542 * FIFO (32 bytes) at specified data rate
2543 */
2544 bits_per_char = info->params.data_bits +
2545 info->params.stop_bits + 1;
2546
2547 info->params.data_rate = tty_get_baud_rate(info->port.tty);
2548
2549 if (info->params.data_rate) {
2550 info->timeout = (32*HZ*bits_per_char) /
2551 info->params.data_rate;
2552 }
2553 info->timeout += HZ/50; /* Add .02 seconds of slop */
2554
2555 tty_port_set_cts_flow(&info->port, cflag & CRTSCTS);
2556 tty_port_set_check_carrier(&info->port, ~cflag & CLOCAL);
2557
2558 /* process tty input control flags */
2559
2560 info->read_status_mask = IRQ_RXOVER;
2561 if (I_INPCK(info->port.tty))
2562 info->read_status_mask |= MASK_PARITY | MASK_FRAMING;
2563 if (I_BRKINT(info->port.tty) || I_PARMRK(info->port.tty))
2564 info->read_status_mask |= MASK_BREAK;
2565 if (I_IGNPAR(info->port.tty))
2566 info->ignore_status_mask |= MASK_PARITY | MASK_FRAMING;
2567 if (I_IGNBRK(info->port.tty)) {
2568 info->ignore_status_mask |= MASK_BREAK;
2569 /* If ignoring parity and break indicators, ignore
2570 * overruns too. (For real raw support).
2571 */
2572 if (I_IGNPAR(info->port.tty))
2573 info->ignore_status_mask |= MASK_OVERRUN;
2574 }
2575
2576 program_hw(info);
2577}
2578
2579static int get_stats(struct slgt_info *info, struct mgsl_icount __user *user_icount)
2580{
2581 DBGINFO(("%s get_stats\n", info->device_name));
2582 if (!user_icount) {
2583 memset(&info->icount, 0, sizeof(info->icount));
2584 } else {
2585 if (copy_to_user(user_icount, &info->icount, sizeof(struct mgsl_icount)))
2586 return -EFAULT;
2587 }
2588 return 0;
2589}
2590
2591static int get_params(struct slgt_info *info, MGSL_PARAMS __user *user_params)
2592{
2593 DBGINFO(("%s get_params\n", info->device_name));
2594 if (copy_to_user(user_params, &info->params, sizeof(MGSL_PARAMS)))
2595 return -EFAULT;
2596 return 0;
2597}
2598
2599static int set_params(struct slgt_info *info, MGSL_PARAMS __user *new_params)
2600{
2601 unsigned long flags;
2602 MGSL_PARAMS tmp_params;
2603
2604 DBGINFO(("%s set_params\n", info->device_name));
2605 if (copy_from_user(&tmp_params, new_params, sizeof(MGSL_PARAMS)))
2606 return -EFAULT;
2607
2608 spin_lock_irqsave(&info->lock, flags);
2609 if (tmp_params.mode == MGSL_MODE_BASE_CLOCK)
2610 info->base_clock = tmp_params.clock_speed;
2611 else
2612 memcpy(&info->params, &tmp_params, sizeof(MGSL_PARAMS));
2613 spin_unlock_irqrestore(&info->lock, flags);
2614
2615 program_hw(info);
2616
2617 return 0;
2618}
2619
2620static int get_txidle(struct slgt_info *info, int __user *idle_mode)
2621{
2622 DBGINFO(("%s get_txidle=%d\n", info->device_name, info->idle_mode));
2623 if (put_user(info->idle_mode, idle_mode))
2624 return -EFAULT;
2625 return 0;
2626}
2627
2628static int set_txidle(struct slgt_info *info, int idle_mode)
2629{
2630 unsigned long flags;
2631 DBGINFO(("%s set_txidle(%d)\n", info->device_name, idle_mode));
2632 spin_lock_irqsave(&info->lock,flags);
2633 info->idle_mode = idle_mode;
2634 if (info->params.mode != MGSL_MODE_ASYNC)
2635 tx_set_idle(info);
2636 spin_unlock_irqrestore(&info->lock,flags);
2637 return 0;
2638}
2639
2640static int tx_enable(struct slgt_info *info, int enable)
2641{
2642 unsigned long flags;
2643 DBGINFO(("%s tx_enable(%d)\n", info->device_name, enable));
2644 spin_lock_irqsave(&info->lock,flags);
2645 if (enable) {
2646 if (!info->tx_enabled)
2647 tx_start(info);
2648 } else {
2649 if (info->tx_enabled)
2650 tx_stop(info);
2651 }
2652 spin_unlock_irqrestore(&info->lock,flags);
2653 return 0;
2654}
2655
2656/*
2657 * abort transmit HDLC frame
2658 */
2659static int tx_abort(struct slgt_info *info)
2660{
2661 unsigned long flags;
2662 DBGINFO(("%s tx_abort\n", info->device_name));
2663 spin_lock_irqsave(&info->lock,flags);
2664 tdma_reset(info);
2665 spin_unlock_irqrestore(&info->lock,flags);
2666 return 0;
2667}
2668
2669static int rx_enable(struct slgt_info *info, int enable)
2670{
2671 unsigned long flags;
2672 unsigned int rbuf_fill_level;
2673 DBGINFO(("%s rx_enable(%08x)\n", info->device_name, enable));
2674 spin_lock_irqsave(&info->lock,flags);
2675 /*
2676 * enable[31..16] = receive DMA buffer fill level
2677 * 0 = noop (leave fill level unchanged)
2678 * fill level must be multiple of 4 and <= buffer size
2679 */
2680 rbuf_fill_level = ((unsigned int)enable) >> 16;
2681 if (rbuf_fill_level) {
2682 if ((rbuf_fill_level > DMABUFSIZE) || (rbuf_fill_level % 4)) {
2683 spin_unlock_irqrestore(&info->lock, flags);
2684 return -EINVAL;
2685 }
2686 info->rbuf_fill_level = rbuf_fill_level;
2687 if (rbuf_fill_level < 128)
2688 info->rx_pio = 1; /* PIO mode */
2689 else
2690 info->rx_pio = 0; /* DMA mode */
2691 rx_stop(info); /* restart receiver to use new fill level */
2692 }
2693
2694 /*
2695 * enable[1..0] = receiver enable command
2696 * 0 = disable
2697 * 1 = enable
2698 * 2 = enable or force hunt mode if already enabled
2699 */
2700 enable &= 3;
2701 if (enable) {
2702 if (!info->rx_enabled)
2703 rx_start(info);
2704 else if (enable == 2) {
2705 /* force hunt mode (write 1 to RCR[3]) */
2706 wr_reg16(info, RCR, rd_reg16(info, RCR) | BIT3);
2707 }
2708 } else {
2709 if (info->rx_enabled)
2710 rx_stop(info);
2711 }
2712 spin_unlock_irqrestore(&info->lock,flags);
2713 return 0;
2714}
2715
2716/*
2717 * wait for specified event to occur
2718 */
2719static int wait_mgsl_event(struct slgt_info *info, int __user *mask_ptr)
2720{
2721 unsigned long flags;
2722 int s;
2723 int rc=0;
2724 struct mgsl_icount cprev, cnow;
2725 int events;
2726 int mask;
2727 struct _input_signal_events oldsigs, newsigs;
2728 DECLARE_WAITQUEUE(wait, current);
2729
2730 if (get_user(mask, mask_ptr))
2731 return -EFAULT;
2732
2733 DBGINFO(("%s wait_mgsl_event(%d)\n", info->device_name, mask));
2734
2735 spin_lock_irqsave(&info->lock,flags);
2736
2737 /* return immediately if state matches requested events */
2738 get_signals(info);
2739 s = info->signals;
2740
2741 events = mask &
2742 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
2743 ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
2744 ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
2745 ((s & SerialSignal_RI) ? MgslEvent_RiActive :MgslEvent_RiInactive) );
2746 if (events) {
2747 spin_unlock_irqrestore(&info->lock,flags);
2748 goto exit;
2749 }
2750
2751 /* save current irq counts */
2752 cprev = info->icount;
2753 oldsigs = info->input_signal_events;
2754
2755 /* enable hunt and idle irqs if needed */
2756 if (mask & (MgslEvent_ExitHuntMode+MgslEvent_IdleReceived)) {
2757 unsigned short val = rd_reg16(info, SCR);
2758 if (!(val & IRQ_RXIDLE))
2759 wr_reg16(info, SCR, (unsigned short)(val | IRQ_RXIDLE));
2760 }
2761
2762 set_current_state(TASK_INTERRUPTIBLE);
2763 add_wait_queue(&info->event_wait_q, &wait);
2764
2765 spin_unlock_irqrestore(&info->lock,flags);
2766
2767 for(;;) {
2768 schedule();
2769 if (signal_pending(current)) {
2770 rc = -ERESTARTSYS;
2771 break;
2772 }
2773
2774 /* get current irq counts */
2775 spin_lock_irqsave(&info->lock,flags);
2776 cnow = info->icount;
2777 newsigs = info->input_signal_events;
2778 set_current_state(TASK_INTERRUPTIBLE);
2779 spin_unlock_irqrestore(&info->lock,flags);
2780
2781 /* if no change, wait aborted for some reason */
2782 if (newsigs.dsr_up == oldsigs.dsr_up &&
2783 newsigs.dsr_down == oldsigs.dsr_down &&
2784 newsigs.dcd_up == oldsigs.dcd_up &&
2785 newsigs.dcd_down == oldsigs.dcd_down &&
2786 newsigs.cts_up == oldsigs.cts_up &&
2787 newsigs.cts_down == oldsigs.cts_down &&
2788 newsigs.ri_up == oldsigs.ri_up &&
2789 newsigs.ri_down == oldsigs.ri_down &&
2790 cnow.exithunt == cprev.exithunt &&
2791 cnow.rxidle == cprev.rxidle) {
2792 rc = -EIO;
2793 break;
2794 }
2795
2796 events = mask &
2797 ( (newsigs.dsr_up != oldsigs.dsr_up ? MgslEvent_DsrActive:0) +
2798 (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
2799 (newsigs.dcd_up != oldsigs.dcd_up ? MgslEvent_DcdActive:0) +
2800 (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
2801 (newsigs.cts_up != oldsigs.cts_up ? MgslEvent_CtsActive:0) +
2802 (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
2803 (newsigs.ri_up != oldsigs.ri_up ? MgslEvent_RiActive:0) +
2804 (newsigs.ri_down != oldsigs.ri_down ? MgslEvent_RiInactive:0) +
2805 (cnow.exithunt != cprev.exithunt ? MgslEvent_ExitHuntMode:0) +
2806 (cnow.rxidle != cprev.rxidle ? MgslEvent_IdleReceived:0) );
2807 if (events)
2808 break;
2809
2810 cprev = cnow;
2811 oldsigs = newsigs;
2812 }
2813
2814 remove_wait_queue(&info->event_wait_q, &wait);
2815 set_current_state(TASK_RUNNING);
2816
2817
2818 if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
2819 spin_lock_irqsave(&info->lock,flags);
2820 if (!waitqueue_active(&info->event_wait_q)) {
2821 /* disable enable exit hunt mode/idle rcvd IRQs */
2822 wr_reg16(info, SCR,
2823 (unsigned short)(rd_reg16(info, SCR) & ~IRQ_RXIDLE));
2824 }
2825 spin_unlock_irqrestore(&info->lock,flags);
2826 }
2827exit:
2828 if (rc == 0)
2829 rc = put_user(events, mask_ptr);
2830 return rc;
2831}
2832
2833static int get_interface(struct slgt_info *info, int __user *if_mode)
2834{
2835 DBGINFO(("%s get_interface=%x\n", info->device_name, info->if_mode));
2836 if (put_user(info->if_mode, if_mode))
2837 return -EFAULT;
2838 return 0;
2839}
2840
2841static int set_interface(struct slgt_info *info, int if_mode)
2842{
2843 unsigned long flags;
2844 unsigned short val;
2845
2846 DBGINFO(("%s set_interface=%x)\n", info->device_name, if_mode));
2847 spin_lock_irqsave(&info->lock,flags);
2848 info->if_mode = if_mode;
2849
2850 msc_set_vcr(info);
2851
2852 /* TCR (tx control) 07 1=RTS driver control */
2853 val = rd_reg16(info, TCR);
2854 if (info->if_mode & MGSL_INTERFACE_RTS_EN)
2855 val |= BIT7;
2856 else
2857 val &= ~BIT7;
2858 wr_reg16(info, TCR, val);
2859
2860 spin_unlock_irqrestore(&info->lock,flags);
2861 return 0;
2862}
2863
2864static int get_xsync(struct slgt_info *info, int __user *xsync)
2865{
2866 DBGINFO(("%s get_xsync=%x\n", info->device_name, info->xsync));
2867 if (put_user(info->xsync, xsync))
2868 return -EFAULT;
2869 return 0;
2870}
2871
2872/*
2873 * set extended sync pattern (1 to 4 bytes) for extended sync mode
2874 *
2875 * sync pattern is contained in least significant bytes of value
2876 * most significant byte of sync pattern is oldest (1st sent/detected)
2877 */
2878static int set_xsync(struct slgt_info *info, int xsync)
2879{
2880 unsigned long flags;
2881
2882 DBGINFO(("%s set_xsync=%x)\n", info->device_name, xsync));
2883 spin_lock_irqsave(&info->lock, flags);
2884 info->xsync = xsync;
2885 wr_reg32(info, XSR, xsync);
2886 spin_unlock_irqrestore(&info->lock, flags);
2887 return 0;
2888}
2889
2890static int get_xctrl(struct slgt_info *info, int __user *xctrl)
2891{
2892 DBGINFO(("%s get_xctrl=%x\n", info->device_name, info->xctrl));
2893 if (put_user(info->xctrl, xctrl))
2894 return -EFAULT;
2895 return 0;
2896}
2897
2898/*
2899 * set extended control options
2900 *
2901 * xctrl[31:19] reserved, must be zero
2902 * xctrl[18:17] extended sync pattern length in bytes
2903 * 00 = 1 byte in xsr[7:0]
2904 * 01 = 2 bytes in xsr[15:0]
2905 * 10 = 3 bytes in xsr[23:0]
2906 * 11 = 4 bytes in xsr[31:0]
2907 * xctrl[16] 1 = enable terminal count, 0=disabled
2908 * xctrl[15:0] receive terminal count for fixed length packets
2909 * value is count minus one (0 = 1 byte packet)
2910 * when terminal count is reached, receiver
2911 * automatically returns to hunt mode and receive
2912 * FIFO contents are flushed to DMA buffers with
2913 * end of frame (EOF) status
2914 */
2915static int set_xctrl(struct slgt_info *info, int xctrl)
2916{
2917 unsigned long flags;
2918
2919 DBGINFO(("%s set_xctrl=%x)\n", info->device_name, xctrl));
2920 spin_lock_irqsave(&info->lock, flags);
2921 info->xctrl = xctrl;
2922 wr_reg32(info, XCR, xctrl);
2923 spin_unlock_irqrestore(&info->lock, flags);
2924 return 0;
2925}
2926
2927/*
2928 * set general purpose IO pin state and direction
2929 *
2930 * user_gpio fields:
2931 * state each bit indicates a pin state
2932 * smask set bit indicates pin state to set
2933 * dir each bit indicates a pin direction (0=input, 1=output)
2934 * dmask set bit indicates pin direction to set
2935 */
2936static int set_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
2937{
2938 unsigned long flags;
2939 struct gpio_desc gpio;
2940 __u32 data;
2941
2942 if (!info->gpio_present)
2943 return -EINVAL;
2944 if (copy_from_user(&gpio, user_gpio, sizeof(gpio)))
2945 return -EFAULT;
2946 DBGINFO(("%s set_gpio state=%08x smask=%08x dir=%08x dmask=%08x\n",
2947 info->device_name, gpio.state, gpio.smask,
2948 gpio.dir, gpio.dmask));
2949
2950 spin_lock_irqsave(&info->port_array[0]->lock, flags);
2951 if (gpio.dmask) {
2952 data = rd_reg32(info, IODR);
2953 data |= gpio.dmask & gpio.dir;
2954 data &= ~(gpio.dmask & ~gpio.dir);
2955 wr_reg32(info, IODR, data);
2956 }
2957 if (gpio.smask) {
2958 data = rd_reg32(info, IOVR);
2959 data |= gpio.smask & gpio.state;
2960 data &= ~(gpio.smask & ~gpio.state);
2961 wr_reg32(info, IOVR, data);
2962 }
2963 spin_unlock_irqrestore(&info->port_array[0]->lock, flags);
2964
2965 return 0;
2966}
2967
2968/*
2969 * get general purpose IO pin state and direction
2970 */
2971static int get_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
2972{
2973 struct gpio_desc gpio;
2974 if (!info->gpio_present)
2975 return -EINVAL;
2976 gpio.state = rd_reg32(info, IOVR);
2977 gpio.smask = 0xffffffff;
2978 gpio.dir = rd_reg32(info, IODR);
2979 gpio.dmask = 0xffffffff;
2980 if (copy_to_user(user_gpio, &gpio, sizeof(gpio)))
2981 return -EFAULT;
2982 DBGINFO(("%s get_gpio state=%08x dir=%08x\n",
2983 info->device_name, gpio.state, gpio.dir));
2984 return 0;
2985}
2986
2987/*
2988 * conditional wait facility
2989 */
2990static void init_cond_wait(struct cond_wait *w, unsigned int data)
2991{
2992 init_waitqueue_head(&w->q);
2993 init_waitqueue_entry(&w->wait, current);
2994 w->data = data;
2995}
2996
2997static void add_cond_wait(struct cond_wait **head, struct cond_wait *w)
2998{
2999 set_current_state(TASK_INTERRUPTIBLE);
3000 add_wait_queue(&w->q, &w->wait);
3001 w->next = *head;
3002 *head = w;
3003}
3004
3005static void remove_cond_wait(struct cond_wait **head, struct cond_wait *cw)
3006{
3007 struct cond_wait *w, *prev;
3008 remove_wait_queue(&cw->q, &cw->wait);
3009 set_current_state(TASK_RUNNING);
3010 for (w = *head, prev = NULL ; w != NULL ; prev = w, w = w->next) {
3011 if (w == cw) {
3012 if (prev != NULL)
3013 prev->next = w->next;
3014 else
3015 *head = w->next;
3016 break;
3017 }
3018 }
3019}
3020
3021static void flush_cond_wait(struct cond_wait **head)
3022{
3023 while (*head != NULL) {
3024 wake_up_interruptible(&(*head)->q);
3025 *head = (*head)->next;
3026 }
3027}
3028
3029/*
3030 * wait for general purpose I/O pin(s) to enter specified state
3031 *
3032 * user_gpio fields:
3033 * state - bit indicates target pin state
3034 * smask - set bit indicates watched pin
3035 *
3036 * The wait ends when at least one watched pin enters the specified
3037 * state. When 0 (no error) is returned, user_gpio->state is set to the
3038 * state of all GPIO pins when the wait ends.
3039 *
3040 * Note: Each pin may be a dedicated input, dedicated output, or
3041 * configurable input/output. The number and configuration of pins
3042 * varies with the specific adapter model. Only input pins (dedicated
3043 * or configured) can be monitored with this function.
3044 */
3045static int wait_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
3046{
3047 unsigned long flags;
3048 int rc = 0;
3049 struct gpio_desc gpio;
3050 struct cond_wait wait;
3051 u32 state;
3052
3053 if (!info->gpio_present)
3054 return -EINVAL;
3055 if (copy_from_user(&gpio, user_gpio, sizeof(gpio)))
3056 return -EFAULT;
3057 DBGINFO(("%s wait_gpio() state=%08x smask=%08x\n",
3058 info->device_name, gpio.state, gpio.smask));
3059 /* ignore output pins identified by set IODR bit */
3060 if ((gpio.smask &= ~rd_reg32(info, IODR)) == 0)
3061 return -EINVAL;
3062 init_cond_wait(&wait, gpio.smask);
3063
3064 spin_lock_irqsave(&info->port_array[0]->lock, flags);
3065 /* enable interrupts for watched pins */
3066 wr_reg32(info, IOER, rd_reg32(info, IOER) | gpio.smask);
3067 /* get current pin states */
3068 state = rd_reg32(info, IOVR);
3069
3070 if (gpio.smask & ~(state ^ gpio.state)) {
3071 /* already in target state */
3072 gpio.state = state;
3073 } else {
3074 /* wait for target state */
3075 add_cond_wait(&info->gpio_wait_q, &wait);
3076 spin_unlock_irqrestore(&info->port_array[0]->lock, flags);
3077 schedule();
3078 if (signal_pending(current))
3079 rc = -ERESTARTSYS;
3080 else
3081 gpio.state = wait.data;
3082 spin_lock_irqsave(&info->port_array[0]->lock, flags);
3083 remove_cond_wait(&info->gpio_wait_q, &wait);
3084 }
3085
3086 /* disable all GPIO interrupts if no waiting processes */
3087 if (info->gpio_wait_q == NULL)
3088 wr_reg32(info, IOER, 0);
3089 spin_unlock_irqrestore(&info->port_array[0]->lock, flags);
3090
3091 if ((rc == 0) && copy_to_user(user_gpio, &gpio, sizeof(gpio)))
3092 rc = -EFAULT;
3093 return rc;
3094}
3095
3096static int modem_input_wait(struct slgt_info *info,int arg)
3097{
3098 unsigned long flags;
3099 int rc;
3100 struct mgsl_icount cprev, cnow;
3101 DECLARE_WAITQUEUE(wait, current);
3102
3103 /* save current irq counts */
3104 spin_lock_irqsave(&info->lock,flags);
3105 cprev = info->icount;
3106 add_wait_queue(&info->status_event_wait_q, &wait);
3107 set_current_state(TASK_INTERRUPTIBLE);
3108 spin_unlock_irqrestore(&info->lock,flags);
3109
3110 for(;;) {
3111 schedule();
3112 if (signal_pending(current)) {
3113 rc = -ERESTARTSYS;
3114 break;
3115 }
3116
3117 /* get new irq counts */
3118 spin_lock_irqsave(&info->lock,flags);
3119 cnow = info->icount;
3120 set_current_state(TASK_INTERRUPTIBLE);
3121 spin_unlock_irqrestore(&info->lock,flags);
3122
3123 /* if no change, wait aborted for some reason */
3124 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
3125 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
3126 rc = -EIO;
3127 break;
3128 }
3129
3130 /* check for change in caller specified modem input */
3131 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
3132 (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
3133 (arg & TIOCM_CD && cnow.dcd != cprev.dcd) ||
3134 (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
3135 rc = 0;
3136 break;
3137 }
3138
3139 cprev = cnow;
3140 }
3141 remove_wait_queue(&info->status_event_wait_q, &wait);
3142 set_current_state(TASK_RUNNING);
3143 return rc;
3144}
3145
3146/*
3147 * return state of serial control and status signals
3148 */
3149static int tiocmget(struct tty_struct *tty)
3150{
3151 struct slgt_info *info = tty->driver_data;
3152 unsigned int result;
3153 unsigned long flags;
3154
3155 spin_lock_irqsave(&info->lock,flags);
3156 get_signals(info);
3157 spin_unlock_irqrestore(&info->lock,flags);
3158
3159 result = ((info->signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
3160 ((info->signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
3161 ((info->signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
3162 ((info->signals & SerialSignal_RI) ? TIOCM_RNG:0) +
3163 ((info->signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
3164 ((info->signals & SerialSignal_CTS) ? TIOCM_CTS:0);
3165
3166 DBGINFO(("%s tiocmget value=%08X\n", info->device_name, result));
3167 return result;
3168}
3169
3170/*
3171 * set modem control signals (DTR/RTS)
3172 *
3173 * cmd signal command: TIOCMBIS = set bit TIOCMBIC = clear bit
3174 * TIOCMSET = set/clear signal values
3175 * value bit mask for command
3176 */
3177static int tiocmset(struct tty_struct *tty,
3178 unsigned int set, unsigned int clear)
3179{
3180 struct slgt_info *info = tty->driver_data;
3181 unsigned long flags;
3182
3183 DBGINFO(("%s tiocmset(%x,%x)\n", info->device_name, set, clear));
3184
3185 if (set & TIOCM_RTS)
3186 info->signals |= SerialSignal_RTS;
3187 if (set & TIOCM_DTR)
3188 info->signals |= SerialSignal_DTR;
3189 if (clear & TIOCM_RTS)
3190 info->signals &= ~SerialSignal_RTS;
3191 if (clear & TIOCM_DTR)
3192 info->signals &= ~SerialSignal_DTR;
3193
3194 spin_lock_irqsave(&info->lock,flags);
3195 set_signals(info);
3196 spin_unlock_irqrestore(&info->lock,flags);
3197 return 0;
3198}
3199
3200static int carrier_raised(struct tty_port *port)
3201{
3202 unsigned long flags;
3203 struct slgt_info *info = container_of(port, struct slgt_info, port);
3204
3205 spin_lock_irqsave(&info->lock,flags);
3206 get_signals(info);
3207 spin_unlock_irqrestore(&info->lock,flags);
3208 return (info->signals & SerialSignal_DCD) ? 1 : 0;
3209}
3210
3211static void dtr_rts(struct tty_port *port, int on)
3212{
3213 unsigned long flags;
3214 struct slgt_info *info = container_of(port, struct slgt_info, port);
3215
3216 spin_lock_irqsave(&info->lock,flags);
3217 if (on)
3218 info->signals |= SerialSignal_RTS | SerialSignal_DTR;
3219 else
3220 info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
3221 set_signals(info);
3222 spin_unlock_irqrestore(&info->lock,flags);
3223}
3224
3225
3226/*
3227 * block current process until the device is ready to open
3228 */
3229static int block_til_ready(struct tty_struct *tty, struct file *filp,
3230 struct slgt_info *info)
3231{
3232 DECLARE_WAITQUEUE(wait, current);
3233 int retval;
3234 bool do_clocal = false;
3235 unsigned long flags;
3236 int cd;
3237 struct tty_port *port = &info->port;
3238
3239 DBGINFO(("%s block_til_ready\n", tty->driver->name));
3240
3241 if (filp->f_flags & O_NONBLOCK || tty_io_error(tty)) {
3242 /* nonblock mode is set or port is not enabled */
3243 tty_port_set_active(port, 1);
3244 return 0;
3245 }
3246
3247 if (C_CLOCAL(tty))
3248 do_clocal = true;
3249
3250 /* Wait for carrier detect and the line to become
3251 * free (i.e., not in use by the callout). While we are in
3252 * this loop, port->count is dropped by one, so that
3253 * close() knows when to free things. We restore it upon
3254 * exit, either normal or abnormal.
3255 */
3256
3257 retval = 0;
3258 add_wait_queue(&port->open_wait, &wait);
3259
3260 spin_lock_irqsave(&info->lock, flags);
3261 port->count--;
3262 spin_unlock_irqrestore(&info->lock, flags);
3263 port->blocked_open++;
3264
3265 while (1) {
3266 if (C_BAUD(tty) && tty_port_initialized(port))
3267 tty_port_raise_dtr_rts(port);
3268
3269 set_current_state(TASK_INTERRUPTIBLE);
3270
3271 if (tty_hung_up_p(filp) || !tty_port_initialized(port)) {
3272 retval = (port->flags & ASYNC_HUP_NOTIFY) ?
3273 -EAGAIN : -ERESTARTSYS;
3274 break;
3275 }
3276
3277 cd = tty_port_carrier_raised(port);
3278 if (do_clocal || cd)
3279 break;
3280
3281 if (signal_pending(current)) {
3282 retval = -ERESTARTSYS;
3283 break;
3284 }
3285
3286 DBGINFO(("%s block_til_ready wait\n", tty->driver->name));
3287 tty_unlock(tty);
3288 schedule();
3289 tty_lock(tty);
3290 }
3291
3292 set_current_state(TASK_RUNNING);
3293 remove_wait_queue(&port->open_wait, &wait);
3294
3295 if (!tty_hung_up_p(filp))
3296 port->count++;
3297 port->blocked_open--;
3298
3299 if (!retval)
3300 tty_port_set_active(port, 1);
3301
3302 DBGINFO(("%s block_til_ready ready, rc=%d\n", tty->driver->name, retval));
3303 return retval;
3304}
3305
3306/*
3307 * allocate buffers used for calling line discipline receive_buf
3308 * directly in synchronous mode
3309 * note: add 5 bytes to max frame size to allow appending
3310 * 32-bit CRC and status byte when configured to do so
3311 */
3312static int alloc_tmp_rbuf(struct slgt_info *info)
3313{
3314 info->tmp_rbuf = kmalloc(info->max_frame_size + 5, GFP_KERNEL);
3315 if (info->tmp_rbuf == NULL)
3316 return -ENOMEM;
3317 /* unused flag buffer to satisfy receive_buf calling interface */
3318 info->flag_buf = kzalloc(info->max_frame_size + 5, GFP_KERNEL);
3319 if (!info->flag_buf) {
3320 kfree(info->tmp_rbuf);
3321 info->tmp_rbuf = NULL;
3322 return -ENOMEM;
3323 }
3324 return 0;
3325}
3326
3327static void free_tmp_rbuf(struct slgt_info *info)
3328{
3329 kfree(info->tmp_rbuf);
3330 info->tmp_rbuf = NULL;
3331 kfree(info->flag_buf);
3332 info->flag_buf = NULL;
3333}
3334
3335/*
3336 * allocate DMA descriptor lists.
3337 */
3338static int alloc_desc(struct slgt_info *info)
3339{
3340 unsigned int i;
3341 unsigned int pbufs;
3342
3343 /* allocate memory to hold descriptor lists */
3344 info->bufs = pci_zalloc_consistent(info->pdev, DESC_LIST_SIZE,
3345 &info->bufs_dma_addr);
3346 if (info->bufs == NULL)
3347 return -ENOMEM;
3348
3349 info->rbufs = (struct slgt_desc*)info->bufs;
3350 info->tbufs = ((struct slgt_desc*)info->bufs) + info->rbuf_count;
3351
3352 pbufs = (unsigned int)info->bufs_dma_addr;
3353
3354 /*
3355 * Build circular lists of descriptors
3356 */
3357
3358 for (i=0; i < info->rbuf_count; i++) {
3359 /* physical address of this descriptor */
3360 info->rbufs[i].pdesc = pbufs + (i * sizeof(struct slgt_desc));
3361
3362 /* physical address of next descriptor */
3363 if (i == info->rbuf_count - 1)
3364 info->rbufs[i].next = cpu_to_le32(pbufs);
3365 else
3366 info->rbufs[i].next = cpu_to_le32(pbufs + ((i+1) * sizeof(struct slgt_desc)));
3367 set_desc_count(info->rbufs[i], DMABUFSIZE);
3368 }
3369
3370 for (i=0; i < info->tbuf_count; i++) {
3371 /* physical address of this descriptor */
3372 info->tbufs[i].pdesc = pbufs + ((info->rbuf_count + i) * sizeof(struct slgt_desc));
3373
3374 /* physical address of next descriptor */
3375 if (i == info->tbuf_count - 1)
3376 info->tbufs[i].next = cpu_to_le32(pbufs + info->rbuf_count * sizeof(struct slgt_desc));
3377 else
3378 info->tbufs[i].next = cpu_to_le32(pbufs + ((info->rbuf_count + i + 1) * sizeof(struct slgt_desc)));
3379 }
3380
3381 return 0;
3382}
3383
3384static void free_desc(struct slgt_info *info)
3385{
3386 if (info->bufs != NULL) {
3387 pci_free_consistent(info->pdev, DESC_LIST_SIZE, info->bufs, info->bufs_dma_addr);
3388 info->bufs = NULL;
3389 info->rbufs = NULL;
3390 info->tbufs = NULL;
3391 }
3392}
3393
3394static int alloc_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count)
3395{
3396 int i;
3397 for (i=0; i < count; i++) {
3398 if ((bufs[i].buf = pci_alloc_consistent(info->pdev, DMABUFSIZE, &bufs[i].buf_dma_addr)) == NULL)
3399 return -ENOMEM;
3400 bufs[i].pbuf = cpu_to_le32((unsigned int)bufs[i].buf_dma_addr);
3401 }
3402 return 0;
3403}
3404
3405static void free_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count)
3406{
3407 int i;
3408 for (i=0; i < count; i++) {
3409 if (bufs[i].buf == NULL)
3410 continue;
3411 pci_free_consistent(info->pdev, DMABUFSIZE, bufs[i].buf, bufs[i].buf_dma_addr);
3412 bufs[i].buf = NULL;
3413 }
3414}
3415
3416static int alloc_dma_bufs(struct slgt_info *info)
3417{
3418 info->rbuf_count = 32;
3419 info->tbuf_count = 32;
3420
3421 if (alloc_desc(info) < 0 ||
3422 alloc_bufs(info, info->rbufs, info->rbuf_count) < 0 ||
3423 alloc_bufs(info, info->tbufs, info->tbuf_count) < 0 ||
3424 alloc_tmp_rbuf(info) < 0) {
3425 DBGERR(("%s DMA buffer alloc fail\n", info->device_name));
3426 return -ENOMEM;
3427 }
3428 reset_rbufs(info);
3429 return 0;
3430}
3431
3432static void free_dma_bufs(struct slgt_info *info)
3433{
3434 if (info->bufs) {
3435 free_bufs(info, info->rbufs, info->rbuf_count);
3436 free_bufs(info, info->tbufs, info->tbuf_count);
3437 free_desc(info);
3438 }
3439 free_tmp_rbuf(info);
3440}
3441
3442static int claim_resources(struct slgt_info *info)
3443{
3444 if (request_mem_region(info->phys_reg_addr, SLGT_REG_SIZE, "synclink_gt") == NULL) {
3445 DBGERR(("%s reg addr conflict, addr=%08X\n",
3446 info->device_name, info->phys_reg_addr));
3447 info->init_error = DiagStatus_AddressConflict;
3448 goto errout;
3449 }
3450 else
3451 info->reg_addr_requested = true;
3452
3453 info->reg_addr = ioremap_nocache(info->phys_reg_addr, SLGT_REG_SIZE);
3454 if (!info->reg_addr) {
3455 DBGERR(("%s can't map device registers, addr=%08X\n",
3456 info->device_name, info->phys_reg_addr));
3457 info->init_error = DiagStatus_CantAssignPciResources;
3458 goto errout;
3459 }
3460 return 0;
3461
3462errout:
3463 release_resources(info);
3464 return -ENODEV;
3465}
3466
3467static void release_resources(struct slgt_info *info)
3468{
3469 if (info->irq_requested) {
3470 free_irq(info->irq_level, info);
3471 info->irq_requested = false;
3472 }
3473
3474 if (info->reg_addr_requested) {
3475 release_mem_region(info->phys_reg_addr, SLGT_REG_SIZE);
3476 info->reg_addr_requested = false;
3477 }
3478
3479 if (info->reg_addr) {
3480 iounmap(info->reg_addr);
3481 info->reg_addr = NULL;
3482 }
3483}
3484
3485/* Add the specified device instance data structure to the
3486 * global linked list of devices and increment the device count.
3487 */
3488static void add_device(struct slgt_info *info)
3489{
3490 char *devstr;
3491
3492 info->next_device = NULL;
3493 info->line = slgt_device_count;
3494 sprintf(info->device_name, "%s%d", tty_dev_prefix, info->line);
3495
3496 if (info->line < MAX_DEVICES) {
3497 if (maxframe[info->line])
3498 info->max_frame_size = maxframe[info->line];
3499 }
3500
3501 slgt_device_count++;
3502
3503 if (!slgt_device_list)
3504 slgt_device_list = info;
3505 else {
3506 struct slgt_info *current_dev = slgt_device_list;
3507 while(current_dev->next_device)
3508 current_dev = current_dev->next_device;
3509 current_dev->next_device = info;
3510 }
3511
3512 if (info->max_frame_size < 4096)
3513 info->max_frame_size = 4096;
3514 else if (info->max_frame_size > 65535)
3515 info->max_frame_size = 65535;
3516
3517 switch(info->pdev->device) {
3518 case SYNCLINK_GT_DEVICE_ID:
3519 devstr = "GT";
3520 break;
3521 case SYNCLINK_GT2_DEVICE_ID:
3522 devstr = "GT2";
3523 break;
3524 case SYNCLINK_GT4_DEVICE_ID:
3525 devstr = "GT4";
3526 break;
3527 case SYNCLINK_AC_DEVICE_ID:
3528 devstr = "AC";
3529 info->params.mode = MGSL_MODE_ASYNC;
3530 break;
3531 default:
3532 devstr = "(unknown model)";
3533 }
3534 printk("SyncLink %s %s IO=%08x IRQ=%d MaxFrameSize=%u\n",
3535 devstr, info->device_name, info->phys_reg_addr,
3536 info->irq_level, info->max_frame_size);
3537
3538#if SYNCLINK_GENERIC_HDLC
3539 hdlcdev_init(info);
3540#endif
3541}
3542
3543static const struct tty_port_operations slgt_port_ops = {
3544 .carrier_raised = carrier_raised,
3545 .dtr_rts = dtr_rts,
3546};
3547
3548/*
3549 * allocate device instance structure, return NULL on failure
3550 */
3551static struct slgt_info *alloc_dev(int adapter_num, int port_num, struct pci_dev *pdev)
3552{
3553 struct slgt_info *info;
3554
3555 info = kzalloc(sizeof(struct slgt_info), GFP_KERNEL);
3556
3557 if (!info) {
3558 DBGERR(("%s device alloc failed adapter=%d port=%d\n",
3559 driver_name, adapter_num, port_num));
3560 } else {
3561 tty_port_init(&info->port);
3562 info->port.ops = &slgt_port_ops;
3563 info->magic = MGSL_MAGIC;
3564 INIT_WORK(&info->task, bh_handler);
3565 info->max_frame_size = 4096;
3566 info->base_clock = 14745600;
3567 info->rbuf_fill_level = DMABUFSIZE;
3568 info->port.close_delay = 5*HZ/10;
3569 info->port.closing_wait = 30*HZ;
3570 init_waitqueue_head(&info->status_event_wait_q);
3571 init_waitqueue_head(&info->event_wait_q);
3572 spin_lock_init(&info->netlock);
3573 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
3574 info->idle_mode = HDLC_TXIDLE_FLAGS;
3575 info->adapter_num = adapter_num;
3576 info->port_num = port_num;
3577
3578 timer_setup(&info->tx_timer, tx_timeout, 0);
3579 timer_setup(&info->rx_timer, rx_timeout, 0);
3580
3581 /* Copy configuration info to device instance data */
3582 info->pdev = pdev;
3583 info->irq_level = pdev->irq;
3584 info->phys_reg_addr = pci_resource_start(pdev,0);
3585
3586 info->bus_type = MGSL_BUS_TYPE_PCI;
3587 info->irq_flags = IRQF_SHARED;
3588
3589 info->init_error = -1; /* assume error, set to 0 on successful init */
3590 }
3591
3592 return info;
3593}
3594
3595static void device_init(int adapter_num, struct pci_dev *pdev)
3596{
3597 struct slgt_info *port_array[SLGT_MAX_PORTS];
3598 int i;
3599 int port_count = 1;
3600
3601 if (pdev->device == SYNCLINK_GT2_DEVICE_ID)
3602 port_count = 2;
3603 else if (pdev->device == SYNCLINK_GT4_DEVICE_ID)
3604 port_count = 4;
3605
3606 /* allocate device instances for all ports */
3607 for (i=0; i < port_count; ++i) {
3608 port_array[i] = alloc_dev(adapter_num, i, pdev);
3609 if (port_array[i] == NULL) {
3610 for (--i; i >= 0; --i) {
3611 tty_port_destroy(&port_array[i]->port);
3612 kfree(port_array[i]);
3613 }
3614 return;
3615 }
3616 }
3617
3618 /* give copy of port_array to all ports and add to device list */
3619 for (i=0; i < port_count; ++i) {
3620 memcpy(port_array[i]->port_array, port_array, sizeof(port_array));
3621 add_device(port_array[i]);
3622 port_array[i]->port_count = port_count;
3623 spin_lock_init(&port_array[i]->lock);
3624 }
3625
3626 /* Allocate and claim adapter resources */
3627 if (!claim_resources(port_array[0])) {
3628
3629 alloc_dma_bufs(port_array[0]);
3630
3631 /* copy resource information from first port to others */
3632 for (i = 1; i < port_count; ++i) {
3633 port_array[i]->irq_level = port_array[0]->irq_level;
3634 port_array[i]->reg_addr = port_array[0]->reg_addr;
3635 alloc_dma_bufs(port_array[i]);
3636 }
3637
3638 if (request_irq(port_array[0]->irq_level,
3639 slgt_interrupt,
3640 port_array[0]->irq_flags,
3641 port_array[0]->device_name,
3642 port_array[0]) < 0) {
3643 DBGERR(("%s request_irq failed IRQ=%d\n",
3644 port_array[0]->device_name,
3645 port_array[0]->irq_level));
3646 } else {
3647 port_array[0]->irq_requested = true;
3648 adapter_test(port_array[0]);
3649 for (i=1 ; i < port_count ; i++) {
3650 port_array[i]->init_error = port_array[0]->init_error;
3651 port_array[i]->gpio_present = port_array[0]->gpio_present;
3652 }
3653 }
3654 }
3655
3656 for (i = 0; i < port_count; ++i) {
3657 struct slgt_info *info = port_array[i];
3658 tty_port_register_device(&info->port, serial_driver, info->line,
3659 &info->pdev->dev);
3660 }
3661}
3662
3663static int init_one(struct pci_dev *dev,
3664 const struct pci_device_id *ent)
3665{
3666 if (pci_enable_device(dev)) {
3667 printk("error enabling pci device %p\n", dev);
3668 return -EIO;
3669 }
3670 pci_set_master(dev);
3671 device_init(slgt_device_count, dev);
3672 return 0;
3673}
3674
3675static void remove_one(struct pci_dev *dev)
3676{
3677}
3678
3679static const struct tty_operations ops = {
3680 .open = open,
3681 .close = close,
3682 .write = write,
3683 .put_char = put_char,
3684 .flush_chars = flush_chars,
3685 .write_room = write_room,
3686 .chars_in_buffer = chars_in_buffer,
3687 .flush_buffer = flush_buffer,
3688 .ioctl = ioctl,
3689 .compat_ioctl = slgt_compat_ioctl,
3690 .throttle = throttle,
3691 .unthrottle = unthrottle,
3692 .send_xchar = send_xchar,
3693 .break_ctl = set_break,
3694 .wait_until_sent = wait_until_sent,
3695 .set_termios = set_termios,
3696 .stop = tx_hold,
3697 .start = tx_release,
3698 .hangup = hangup,
3699 .tiocmget = tiocmget,
3700 .tiocmset = tiocmset,
3701 .get_icount = get_icount,
3702 .proc_show = synclink_gt_proc_show,
3703};
3704
3705static void slgt_cleanup(void)
3706{
3707 int rc;
3708 struct slgt_info *info;
3709 struct slgt_info *tmp;
3710
3711 printk(KERN_INFO "unload %s\n", driver_name);
3712
3713 if (serial_driver) {
3714 for (info=slgt_device_list ; info != NULL ; info=info->next_device)
3715 tty_unregister_device(serial_driver, info->line);
3716 rc = tty_unregister_driver(serial_driver);
3717 if (rc)
3718 DBGERR(("tty_unregister_driver error=%d\n", rc));
3719 put_tty_driver(serial_driver);
3720 }
3721
3722 /* reset devices */
3723 info = slgt_device_list;
3724 while(info) {
3725 reset_port(info);
3726 info = info->next_device;
3727 }
3728
3729 /* release devices */
3730 info = slgt_device_list;
3731 while(info) {
3732#if SYNCLINK_GENERIC_HDLC
3733 hdlcdev_exit(info);
3734#endif
3735 free_dma_bufs(info);
3736 free_tmp_rbuf(info);
3737 if (info->port_num == 0)
3738 release_resources(info);
3739 tmp = info;
3740 info = info->next_device;
3741 tty_port_destroy(&tmp->port);
3742 kfree(tmp);
3743 }
3744
3745 if (pci_registered)
3746 pci_unregister_driver(&pci_driver);
3747}
3748
3749/*
3750 * Driver initialization entry point.
3751 */
3752static int __init slgt_init(void)
3753{
3754 int rc;
3755
3756 printk(KERN_INFO "%s\n", driver_name);
3757
3758 serial_driver = alloc_tty_driver(MAX_DEVICES);
3759 if (!serial_driver) {
3760 printk("%s can't allocate tty driver\n", driver_name);
3761 return -ENOMEM;
3762 }
3763
3764 /* Initialize the tty_driver structure */
3765
3766 serial_driver->driver_name = slgt_driver_name;
3767 serial_driver->name = tty_dev_prefix;
3768 serial_driver->major = ttymajor;
3769 serial_driver->minor_start = 64;
3770 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
3771 serial_driver->subtype = SERIAL_TYPE_NORMAL;
3772 serial_driver->init_termios = tty_std_termios;
3773 serial_driver->init_termios.c_cflag =
3774 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
3775 serial_driver->init_termios.c_ispeed = 9600;
3776 serial_driver->init_termios.c_ospeed = 9600;
3777 serial_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
3778 tty_set_operations(serial_driver, &ops);
3779 if ((rc = tty_register_driver(serial_driver)) < 0) {
3780 DBGERR(("%s can't register serial driver\n", driver_name));
3781 put_tty_driver(serial_driver);
3782 serial_driver = NULL;
3783 goto error;
3784 }
3785
3786 printk(KERN_INFO "%s, tty major#%d\n",
3787 driver_name, serial_driver->major);
3788
3789 slgt_device_count = 0;
3790 if ((rc = pci_register_driver(&pci_driver)) < 0) {
3791 printk("%s pci_register_driver error=%d\n", driver_name, rc);
3792 goto error;
3793 }
3794 pci_registered = true;
3795
3796 if (!slgt_device_list)
3797 printk("%s no devices found\n",driver_name);
3798
3799 return 0;
3800
3801error:
3802 slgt_cleanup();
3803 return rc;
3804}
3805
3806static void __exit slgt_exit(void)
3807{
3808 slgt_cleanup();
3809}
3810
3811module_init(slgt_init);
3812module_exit(slgt_exit);
3813
3814/*
3815 * register access routines
3816 */
3817
3818#define CALC_REGADDR() \
3819 unsigned long reg_addr = ((unsigned long)info->reg_addr) + addr; \
3820 if (addr >= 0x80) \
3821 reg_addr += (info->port_num) * 32; \
3822 else if (addr >= 0x40) \
3823 reg_addr += (info->port_num) * 16;
3824
3825static __u8 rd_reg8(struct slgt_info *info, unsigned int addr)
3826{
3827 CALC_REGADDR();
3828 return readb((void __iomem *)reg_addr);
3829}
3830
3831static void wr_reg8(struct slgt_info *info, unsigned int addr, __u8 value)
3832{
3833 CALC_REGADDR();
3834 writeb(value, (void __iomem *)reg_addr);
3835}
3836
3837static __u16 rd_reg16(struct slgt_info *info, unsigned int addr)
3838{
3839 CALC_REGADDR();
3840 return readw((void __iomem *)reg_addr);
3841}
3842
3843static void wr_reg16(struct slgt_info *info, unsigned int addr, __u16 value)
3844{
3845 CALC_REGADDR();
3846 writew(value, (void __iomem *)reg_addr);
3847}
3848
3849static __u32 rd_reg32(struct slgt_info *info, unsigned int addr)
3850{
3851 CALC_REGADDR();
3852 return readl((void __iomem *)reg_addr);
3853}
3854
3855static void wr_reg32(struct slgt_info *info, unsigned int addr, __u32 value)
3856{
3857 CALC_REGADDR();
3858 writel(value, (void __iomem *)reg_addr);
3859}
3860
3861static void rdma_reset(struct slgt_info *info)
3862{
3863 unsigned int i;
3864
3865 /* set reset bit */
3866 wr_reg32(info, RDCSR, BIT1);
3867
3868 /* wait for enable bit cleared */
3869 for(i=0 ; i < 1000 ; i++)
3870 if (!(rd_reg32(info, RDCSR) & BIT0))
3871 break;
3872}
3873
3874static void tdma_reset(struct slgt_info *info)
3875{
3876 unsigned int i;
3877
3878 /* set reset bit */
3879 wr_reg32(info, TDCSR, BIT1);
3880
3881 /* wait for enable bit cleared */
3882 for(i=0 ; i < 1000 ; i++)
3883 if (!(rd_reg32(info, TDCSR) & BIT0))
3884 break;
3885}
3886
3887/*
3888 * enable internal loopback
3889 * TxCLK and RxCLK are generated from BRG
3890 * and TxD is looped back to RxD internally.
3891 */
3892static void enable_loopback(struct slgt_info *info)
3893{
3894 /* SCR (serial control) BIT2=loopback enable */
3895 wr_reg16(info, SCR, (unsigned short)(rd_reg16(info, SCR) | BIT2));
3896
3897 if (info->params.mode != MGSL_MODE_ASYNC) {
3898 /* CCR (clock control)
3899 * 07..05 tx clock source (010 = BRG)
3900 * 04..02 rx clock source (010 = BRG)
3901 * 01 auxclk enable (0 = disable)
3902 * 00 BRG enable (1 = enable)
3903 *
3904 * 0100 1001
3905 */
3906 wr_reg8(info, CCR, 0x49);
3907
3908 /* set speed if available, otherwise use default */
3909 if (info->params.clock_speed)
3910 set_rate(info, info->params.clock_speed);
3911 else
3912 set_rate(info, 3686400);
3913 }
3914}
3915
3916/*
3917 * set baud rate generator to specified rate
3918 */
3919static void set_rate(struct slgt_info *info, u32 rate)
3920{
3921 unsigned int div;
3922 unsigned int osc = info->base_clock;
3923
3924 /* div = osc/rate - 1
3925 *
3926 * Round div up if osc/rate is not integer to
3927 * force to next slowest rate.
3928 */
3929
3930 if (rate) {
3931 div = osc/rate;
3932 if (!(osc % rate) && div)
3933 div--;
3934 wr_reg16(info, BDR, (unsigned short)div);
3935 }
3936}
3937
3938static void rx_stop(struct slgt_info *info)
3939{
3940 unsigned short val;
3941
3942 /* disable and reset receiver */
3943 val = rd_reg16(info, RCR) & ~BIT1; /* clear enable bit */
3944 wr_reg16(info, RCR, (unsigned short)(val | BIT2)); /* set reset bit */
3945 wr_reg16(info, RCR, val); /* clear reset bit */
3946
3947 slgt_irq_off(info, IRQ_RXOVER + IRQ_RXDATA + IRQ_RXIDLE);
3948
3949 /* clear pending rx interrupts */
3950 wr_reg16(info, SSR, IRQ_RXIDLE + IRQ_RXOVER);
3951
3952 rdma_reset(info);
3953
3954 info->rx_enabled = false;
3955 info->rx_restart = false;
3956}
3957
3958static void rx_start(struct slgt_info *info)
3959{
3960 unsigned short val;
3961
3962 slgt_irq_off(info, IRQ_RXOVER + IRQ_RXDATA);
3963
3964 /* clear pending rx overrun IRQ */
3965 wr_reg16(info, SSR, IRQ_RXOVER);
3966
3967 /* reset and disable receiver */
3968 val = rd_reg16(info, RCR) & ~BIT1; /* clear enable bit */
3969 wr_reg16(info, RCR, (unsigned short)(val | BIT2)); /* set reset bit */
3970 wr_reg16(info, RCR, val); /* clear reset bit */
3971
3972 rdma_reset(info);
3973 reset_rbufs(info);
3974
3975 if (info->rx_pio) {
3976 /* rx request when rx FIFO not empty */
3977 wr_reg16(info, SCR, (unsigned short)(rd_reg16(info, SCR) & ~BIT14));
3978 slgt_irq_on(info, IRQ_RXDATA);
3979 if (info->params.mode == MGSL_MODE_ASYNC) {
3980 /* enable saving of rx status */
3981 wr_reg32(info, RDCSR, BIT6);
3982 }
3983 } else {
3984 /* rx request when rx FIFO half full */
3985 wr_reg16(info, SCR, (unsigned short)(rd_reg16(info, SCR) | BIT14));
3986 /* set 1st descriptor address */
3987 wr_reg32(info, RDDAR, info->rbufs[0].pdesc);
3988
3989 if (info->params.mode != MGSL_MODE_ASYNC) {
3990 /* enable rx DMA and DMA interrupt */
3991 wr_reg32(info, RDCSR, (BIT2 + BIT0));
3992 } else {
3993 /* enable saving of rx status, rx DMA and DMA interrupt */
3994 wr_reg32(info, RDCSR, (BIT6 + BIT2 + BIT0));
3995 }
3996 }
3997
3998 slgt_irq_on(info, IRQ_RXOVER);
3999
4000 /* enable receiver */
4001 wr_reg16(info, RCR, (unsigned short)(rd_reg16(info, RCR) | BIT1));
4002
4003 info->rx_restart = false;
4004 info->rx_enabled = true;
4005}
4006
4007static void tx_start(struct slgt_info *info)
4008{
4009 if (!info->tx_enabled) {
4010 wr_reg16(info, TCR,
4011 (unsigned short)((rd_reg16(info, TCR) | BIT1) & ~BIT2));
4012 info->tx_enabled = true;
4013 }
4014
4015 if (desc_count(info->tbufs[info->tbuf_start])) {
4016 info->drop_rts_on_tx_done = false;
4017
4018 if (info->params.mode != MGSL_MODE_ASYNC) {
4019 if (info->params.flags & HDLC_FLAG_AUTO_RTS) {
4020 get_signals(info);
4021 if (!(info->signals & SerialSignal_RTS)) {
4022 info->signals |= SerialSignal_RTS;
4023 set_signals(info);
4024 info->drop_rts_on_tx_done = true;
4025 }
4026 }
4027
4028 slgt_irq_off(info, IRQ_TXDATA);
4029 slgt_irq_on(info, IRQ_TXUNDER + IRQ_TXIDLE);
4030 /* clear tx idle and underrun status bits */
4031 wr_reg16(info, SSR, (unsigned short)(IRQ_TXIDLE + IRQ_TXUNDER));
4032 } else {
4033 slgt_irq_off(info, IRQ_TXDATA);
4034 slgt_irq_on(info, IRQ_TXIDLE);
4035 /* clear tx idle status bit */
4036 wr_reg16(info, SSR, IRQ_TXIDLE);
4037 }
4038 /* set 1st descriptor address and start DMA */
4039 wr_reg32(info, TDDAR, info->tbufs[info->tbuf_start].pdesc);
4040 wr_reg32(info, TDCSR, BIT2 + BIT0);
4041 info->tx_active = true;
4042 }
4043}
4044
4045static void tx_stop(struct slgt_info *info)
4046{
4047 unsigned short val;
4048
4049 del_timer(&info->tx_timer);
4050
4051 tdma_reset(info);
4052
4053 /* reset and disable transmitter */
4054 val = rd_reg16(info, TCR) & ~BIT1; /* clear enable bit */
4055 wr_reg16(info, TCR, (unsigned short)(val | BIT2)); /* set reset bit */
4056
4057 slgt_irq_off(info, IRQ_TXDATA + IRQ_TXIDLE + IRQ_TXUNDER);
4058
4059 /* clear tx idle and underrun status bit */
4060 wr_reg16(info, SSR, (unsigned short)(IRQ_TXIDLE + IRQ_TXUNDER));
4061
4062 reset_tbufs(info);
4063
4064 info->tx_enabled = false;
4065 info->tx_active = false;
4066}
4067
4068static void reset_port(struct slgt_info *info)
4069{
4070 if (!info->reg_addr)
4071 return;
4072
4073 tx_stop(info);
4074 rx_stop(info);
4075
4076 info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
4077 set_signals(info);
4078
4079 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
4080}
4081
4082static void reset_adapter(struct slgt_info *info)
4083{
4084 int i;
4085 for (i=0; i < info->port_count; ++i) {
4086 if (info->port_array[i])
4087 reset_port(info->port_array[i]);
4088 }
4089}
4090
4091static void async_mode(struct slgt_info *info)
4092{
4093 unsigned short val;
4094
4095 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
4096 tx_stop(info);
4097 rx_stop(info);
4098
4099 /* TCR (tx control)
4100 *
4101 * 15..13 mode, 010=async
4102 * 12..10 encoding, 000=NRZ
4103 * 09 parity enable
4104 * 08 1=odd parity, 0=even parity
4105 * 07 1=RTS driver control
4106 * 06 1=break enable
4107 * 05..04 character length
4108 * 00=5 bits
4109 * 01=6 bits
4110 * 10=7 bits
4111 * 11=8 bits
4112 * 03 0=1 stop bit, 1=2 stop bits
4113 * 02 reset
4114 * 01 enable
4115 * 00 auto-CTS enable
4116 */
4117 val = 0x4000;
4118
4119 if (info->if_mode & MGSL_INTERFACE_RTS_EN)
4120 val |= BIT7;
4121
4122 if (info->params.parity != ASYNC_PARITY_NONE) {
4123 val |= BIT9;
4124 if (info->params.parity == ASYNC_PARITY_ODD)
4125 val |= BIT8;
4126 }
4127
4128 switch (info->params.data_bits)
4129 {
4130 case 6: val |= BIT4; break;
4131 case 7: val |= BIT5; break;
4132 case 8: val |= BIT5 + BIT4; break;
4133 }
4134
4135 if (info->params.stop_bits != 1)
4136 val |= BIT3;
4137
4138 if (info->params.flags & HDLC_FLAG_AUTO_CTS)
4139 val |= BIT0;
4140
4141 wr_reg16(info, TCR, val);
4142
4143 /* RCR (rx control)
4144 *
4145 * 15..13 mode, 010=async
4146 * 12..10 encoding, 000=NRZ
4147 * 09 parity enable
4148 * 08 1=odd parity, 0=even parity
4149 * 07..06 reserved, must be 0
4150 * 05..04 character length
4151 * 00=5 bits
4152 * 01=6 bits
4153 * 10=7 bits
4154 * 11=8 bits
4155 * 03 reserved, must be zero
4156 * 02 reset
4157 * 01 enable
4158 * 00 auto-DCD enable
4159 */
4160 val = 0x4000;
4161
4162 if (info->params.parity != ASYNC_PARITY_NONE) {
4163 val |= BIT9;
4164 if (info->params.parity == ASYNC_PARITY_ODD)
4165 val |= BIT8;
4166 }
4167
4168 switch (info->params.data_bits)
4169 {
4170 case 6: val |= BIT4; break;
4171 case 7: val |= BIT5; break;
4172 case 8: val |= BIT5 + BIT4; break;
4173 }
4174
4175 if (info->params.flags & HDLC_FLAG_AUTO_DCD)
4176 val |= BIT0;
4177
4178 wr_reg16(info, RCR, val);
4179
4180 /* CCR (clock control)
4181 *
4182 * 07..05 011 = tx clock source is BRG/16
4183 * 04..02 010 = rx clock source is BRG
4184 * 01 0 = auxclk disabled
4185 * 00 1 = BRG enabled
4186 *
4187 * 0110 1001
4188 */
4189 wr_reg8(info, CCR, 0x69);
4190
4191 msc_set_vcr(info);
4192
4193 /* SCR (serial control)
4194 *
4195 * 15 1=tx req on FIFO half empty
4196 * 14 1=rx req on FIFO half full
4197 * 13 tx data IRQ enable
4198 * 12 tx idle IRQ enable
4199 * 11 rx break on IRQ enable
4200 * 10 rx data IRQ enable
4201 * 09 rx break off IRQ enable
4202 * 08 overrun IRQ enable
4203 * 07 DSR IRQ enable
4204 * 06 CTS IRQ enable
4205 * 05 DCD IRQ enable
4206 * 04 RI IRQ enable
4207 * 03 0=16x sampling, 1=8x sampling
4208 * 02 1=txd->rxd internal loopback enable
4209 * 01 reserved, must be zero
4210 * 00 1=master IRQ enable
4211 */
4212 val = BIT15 + BIT14 + BIT0;
4213 /* JCR[8] : 1 = x8 async mode feature available */
4214 if ((rd_reg32(info, JCR) & BIT8) && info->params.data_rate &&
4215 ((info->base_clock < (info->params.data_rate * 16)) ||
4216 (info->base_clock % (info->params.data_rate * 16)))) {
4217 /* use 8x sampling */
4218 val |= BIT3;
4219 set_rate(info, info->params.data_rate * 8);
4220 } else {
4221 /* use 16x sampling */
4222 set_rate(info, info->params.data_rate * 16);
4223 }
4224 wr_reg16(info, SCR, val);
4225
4226 slgt_irq_on(info, IRQ_RXBREAK | IRQ_RXOVER);
4227
4228 if (info->params.loopback)
4229 enable_loopback(info);
4230}
4231
4232static void sync_mode(struct slgt_info *info)
4233{
4234 unsigned short val;
4235
4236 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
4237 tx_stop(info);
4238 rx_stop(info);
4239
4240 /* TCR (tx control)
4241 *
4242 * 15..13 mode
4243 * 000=HDLC/SDLC
4244 * 001=raw bit synchronous
4245 * 010=asynchronous/isochronous
4246 * 011=monosync byte synchronous
4247 * 100=bisync byte synchronous
4248 * 101=xsync byte synchronous
4249 * 12..10 encoding
4250 * 09 CRC enable
4251 * 08 CRC32
4252 * 07 1=RTS driver control
4253 * 06 preamble enable
4254 * 05..04 preamble length
4255 * 03 share open/close flag
4256 * 02 reset
4257 * 01 enable
4258 * 00 auto-CTS enable
4259 */
4260 val = BIT2;
4261
4262 switch(info->params.mode) {
4263 case MGSL_MODE_XSYNC:
4264 val |= BIT15 + BIT13;
4265 break;
4266 case MGSL_MODE_MONOSYNC: val |= BIT14 + BIT13; break;
4267 case MGSL_MODE_BISYNC: val |= BIT15; break;
4268 case MGSL_MODE_RAW: val |= BIT13; break;
4269 }
4270 if (info->if_mode & MGSL_INTERFACE_RTS_EN)
4271 val |= BIT7;
4272
4273 switch(info->params.encoding)
4274 {
4275 case HDLC_ENCODING_NRZB: val |= BIT10; break;
4276 case HDLC_ENCODING_NRZI_MARK: val |= BIT11; break;
4277 case HDLC_ENCODING_NRZI: val |= BIT11 + BIT10; break;
4278 case HDLC_ENCODING_BIPHASE_MARK: val |= BIT12; break;
4279 case HDLC_ENCODING_BIPHASE_SPACE: val |= BIT12 + BIT10; break;
4280 case HDLC_ENCODING_BIPHASE_LEVEL: val |= BIT12 + BIT11; break;
4281 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: val |= BIT12 + BIT11 + BIT10; break;
4282 }
4283
4284 switch (info->params.crc_type & HDLC_CRC_MASK)
4285 {
4286 case HDLC_CRC_16_CCITT: val |= BIT9; break;
4287 case HDLC_CRC_32_CCITT: val |= BIT9 + BIT8; break;
4288 }
4289
4290 if (info->params.preamble != HDLC_PREAMBLE_PATTERN_NONE)
4291 val |= BIT6;
4292
4293 switch (info->params.preamble_length)
4294 {
4295 case HDLC_PREAMBLE_LENGTH_16BITS: val |= BIT5; break;
4296 case HDLC_PREAMBLE_LENGTH_32BITS: val |= BIT4; break;
4297 case HDLC_PREAMBLE_LENGTH_64BITS: val |= BIT5 + BIT4; break;
4298 }
4299
4300 if (info->params.flags & HDLC_FLAG_AUTO_CTS)
4301 val |= BIT0;
4302
4303 wr_reg16(info, TCR, val);
4304
4305 /* TPR (transmit preamble) */
4306
4307 switch (info->params.preamble)
4308 {
4309 case HDLC_PREAMBLE_PATTERN_FLAGS: val = 0x7e; break;
4310 case HDLC_PREAMBLE_PATTERN_ONES: val = 0xff; break;
4311 case HDLC_PREAMBLE_PATTERN_ZEROS: val = 0x00; break;
4312 case HDLC_PREAMBLE_PATTERN_10: val = 0x55; break;
4313 case HDLC_PREAMBLE_PATTERN_01: val = 0xaa; break;
4314 default: val = 0x7e; break;
4315 }
4316 wr_reg8(info, TPR, (unsigned char)val);
4317
4318 /* RCR (rx control)
4319 *
4320 * 15..13 mode
4321 * 000=HDLC/SDLC
4322 * 001=raw bit synchronous
4323 * 010=asynchronous/isochronous
4324 * 011=monosync byte synchronous
4325 * 100=bisync byte synchronous
4326 * 101=xsync byte synchronous
4327 * 12..10 encoding
4328 * 09 CRC enable
4329 * 08 CRC32
4330 * 07..03 reserved, must be 0
4331 * 02 reset
4332 * 01 enable
4333 * 00 auto-DCD enable
4334 */
4335 val = 0;
4336
4337 switch(info->params.mode) {
4338 case MGSL_MODE_XSYNC:
4339 val |= BIT15 + BIT13;
4340 break;
4341 case MGSL_MODE_MONOSYNC: val |= BIT14 + BIT13; break;
4342 case MGSL_MODE_BISYNC: val |= BIT15; break;
4343 case MGSL_MODE_RAW: val |= BIT13; break;
4344 }
4345
4346 switch(info->params.encoding)
4347 {
4348 case HDLC_ENCODING_NRZB: val |= BIT10; break;
4349 case HDLC_ENCODING_NRZI_MARK: val |= BIT11; break;
4350 case HDLC_ENCODING_NRZI: val |= BIT11 + BIT10; break;
4351 case HDLC_ENCODING_BIPHASE_MARK: val |= BIT12; break;
4352 case HDLC_ENCODING_BIPHASE_SPACE: val |= BIT12 + BIT10; break;
4353 case HDLC_ENCODING_BIPHASE_LEVEL: val |= BIT12 + BIT11; break;
4354 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: val |= BIT12 + BIT11 + BIT10; break;
4355 }
4356
4357 switch (info->params.crc_type & HDLC_CRC_MASK)
4358 {
4359 case HDLC_CRC_16_CCITT: val |= BIT9; break;
4360 case HDLC_CRC_32_CCITT: val |= BIT9 + BIT8; break;
4361 }
4362
4363 if (info->params.flags & HDLC_FLAG_AUTO_DCD)
4364 val |= BIT0;
4365
4366 wr_reg16(info, RCR, val);
4367
4368 /* CCR (clock control)
4369 *
4370 * 07..05 tx clock source
4371 * 04..02 rx clock source
4372 * 01 auxclk enable
4373 * 00 BRG enable
4374 */
4375 val = 0;
4376
4377 if (info->params.flags & HDLC_FLAG_TXC_BRG)
4378 {
4379 // when RxC source is DPLL, BRG generates 16X DPLL
4380 // reference clock, so take TxC from BRG/16 to get
4381 // transmit clock at actual data rate
4382 if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4383 val |= BIT6 + BIT5; /* 011, txclk = BRG/16 */
4384 else
4385 val |= BIT6; /* 010, txclk = BRG */
4386 }
4387 else if (info->params.flags & HDLC_FLAG_TXC_DPLL)
4388 val |= BIT7; /* 100, txclk = DPLL Input */
4389 else if (info->params.flags & HDLC_FLAG_TXC_RXCPIN)
4390 val |= BIT5; /* 001, txclk = RXC Input */
4391
4392 if (info->params.flags & HDLC_FLAG_RXC_BRG)
4393 val |= BIT3; /* 010, rxclk = BRG */
4394 else if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4395 val |= BIT4; /* 100, rxclk = DPLL */
4396 else if (info->params.flags & HDLC_FLAG_RXC_TXCPIN)
4397 val |= BIT2; /* 001, rxclk = TXC Input */
4398
4399 if (info->params.clock_speed)
4400 val |= BIT1 + BIT0;
4401
4402 wr_reg8(info, CCR, (unsigned char)val);
4403
4404 if (info->params.flags & (HDLC_FLAG_TXC_DPLL + HDLC_FLAG_RXC_DPLL))
4405 {
4406 // program DPLL mode
4407 switch(info->params.encoding)
4408 {
4409 case HDLC_ENCODING_BIPHASE_MARK:
4410 case HDLC_ENCODING_BIPHASE_SPACE:
4411 val = BIT7; break;
4412 case HDLC_ENCODING_BIPHASE_LEVEL:
4413 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL:
4414 val = BIT7 + BIT6; break;
4415 default: val = BIT6; // NRZ encodings
4416 }
4417 wr_reg16(info, RCR, (unsigned short)(rd_reg16(info, RCR) | val));
4418
4419 // DPLL requires a 16X reference clock from BRG
4420 set_rate(info, info->params.clock_speed * 16);
4421 }
4422 else
4423 set_rate(info, info->params.clock_speed);
4424
4425 tx_set_idle(info);
4426
4427 msc_set_vcr(info);
4428
4429 /* SCR (serial control)
4430 *
4431 * 15 1=tx req on FIFO half empty
4432 * 14 1=rx req on FIFO half full
4433 * 13 tx data IRQ enable
4434 * 12 tx idle IRQ enable
4435 * 11 underrun IRQ enable
4436 * 10 rx data IRQ enable
4437 * 09 rx idle IRQ enable
4438 * 08 overrun IRQ enable
4439 * 07 DSR IRQ enable
4440 * 06 CTS IRQ enable
4441 * 05 DCD IRQ enable
4442 * 04 RI IRQ enable
4443 * 03 reserved, must be zero
4444 * 02 1=txd->rxd internal loopback enable
4445 * 01 reserved, must be zero
4446 * 00 1=master IRQ enable
4447 */
4448 wr_reg16(info, SCR, BIT15 + BIT14 + BIT0);
4449
4450 if (info->params.loopback)
4451 enable_loopback(info);
4452}
4453
4454/*
4455 * set transmit idle mode
4456 */
4457static void tx_set_idle(struct slgt_info *info)
4458{
4459 unsigned char val;
4460 unsigned short tcr;
4461
4462 /* if preamble enabled (tcr[6] == 1) then tx idle size = 8 bits
4463 * else tcr[5:4] = tx idle size: 00 = 8 bits, 01 = 16 bits
4464 */
4465 tcr = rd_reg16(info, TCR);
4466 if (info->idle_mode & HDLC_TXIDLE_CUSTOM_16) {
4467 /* disable preamble, set idle size to 16 bits */
4468 tcr = (tcr & ~(BIT6 + BIT5)) | BIT4;
4469 /* MSB of 16 bit idle specified in tx preamble register (TPR) */
4470 wr_reg8(info, TPR, (unsigned char)((info->idle_mode >> 8) & 0xff));
4471 } else if (!(tcr & BIT6)) {
4472 /* preamble is disabled, set idle size to 8 bits */
4473 tcr &= ~(BIT5 + BIT4);
4474 }
4475 wr_reg16(info, TCR, tcr);
4476
4477 if (info->idle_mode & (HDLC_TXIDLE_CUSTOM_8 | HDLC_TXIDLE_CUSTOM_16)) {
4478 /* LSB of custom tx idle specified in tx idle register */
4479 val = (unsigned char)(info->idle_mode & 0xff);
4480 } else {
4481 /* standard 8 bit idle patterns */
4482 switch(info->idle_mode)
4483 {
4484 case HDLC_TXIDLE_FLAGS: val = 0x7e; break;
4485 case HDLC_TXIDLE_ALT_ZEROS_ONES:
4486 case HDLC_TXIDLE_ALT_MARK_SPACE: val = 0xaa; break;
4487 case HDLC_TXIDLE_ZEROS:
4488 case HDLC_TXIDLE_SPACE: val = 0x00; break;
4489 default: val = 0xff;
4490 }
4491 }
4492
4493 wr_reg8(info, TIR, val);
4494}
4495
4496/*
4497 * get state of V24 status (input) signals
4498 */
4499static void get_signals(struct slgt_info *info)
4500{
4501 unsigned short status = rd_reg16(info, SSR);
4502
4503 /* clear all serial signals except RTS and DTR */
4504 info->signals &= SerialSignal_RTS | SerialSignal_DTR;
4505
4506 if (status & BIT3)
4507 info->signals |= SerialSignal_DSR;
4508 if (status & BIT2)
4509 info->signals |= SerialSignal_CTS;
4510 if (status & BIT1)
4511 info->signals |= SerialSignal_DCD;
4512 if (status & BIT0)
4513 info->signals |= SerialSignal_RI;
4514}
4515
4516/*
4517 * set V.24 Control Register based on current configuration
4518 */
4519static void msc_set_vcr(struct slgt_info *info)
4520{
4521 unsigned char val = 0;
4522
4523 /* VCR (V.24 control)
4524 *
4525 * 07..04 serial IF select
4526 * 03 DTR
4527 * 02 RTS
4528 * 01 LL
4529 * 00 RL
4530 */
4531
4532 switch(info->if_mode & MGSL_INTERFACE_MASK)
4533 {
4534 case MGSL_INTERFACE_RS232:
4535 val |= BIT5; /* 0010 */
4536 break;
4537 case MGSL_INTERFACE_V35:
4538 val |= BIT7 + BIT6 + BIT5; /* 1110 */
4539 break;
4540 case MGSL_INTERFACE_RS422:
4541 val |= BIT6; /* 0100 */
4542 break;
4543 }
4544
4545 if (info->if_mode & MGSL_INTERFACE_MSB_FIRST)
4546 val |= BIT4;
4547 if (info->signals & SerialSignal_DTR)
4548 val |= BIT3;
4549 if (info->signals & SerialSignal_RTS)
4550 val |= BIT2;
4551 if (info->if_mode & MGSL_INTERFACE_LL)
4552 val |= BIT1;
4553 if (info->if_mode & MGSL_INTERFACE_RL)
4554 val |= BIT0;
4555 wr_reg8(info, VCR, val);
4556}
4557
4558/*
4559 * set state of V24 control (output) signals
4560 */
4561static void set_signals(struct slgt_info *info)
4562{
4563 unsigned char val = rd_reg8(info, VCR);
4564 if (info->signals & SerialSignal_DTR)
4565 val |= BIT3;
4566 else
4567 val &= ~BIT3;
4568 if (info->signals & SerialSignal_RTS)
4569 val |= BIT2;
4570 else
4571 val &= ~BIT2;
4572 wr_reg8(info, VCR, val);
4573}
4574
4575/*
4576 * free range of receive DMA buffers (i to last)
4577 */
4578static void free_rbufs(struct slgt_info *info, unsigned int i, unsigned int last)
4579{
4580 int done = 0;
4581
4582 while(!done) {
4583 /* reset current buffer for reuse */
4584 info->rbufs[i].status = 0;
4585 set_desc_count(info->rbufs[i], info->rbuf_fill_level);
4586 if (i == last)
4587 done = 1;
4588 if (++i == info->rbuf_count)
4589 i = 0;
4590 }
4591 info->rbuf_current = i;
4592}
4593
4594/*
4595 * mark all receive DMA buffers as free
4596 */
4597static void reset_rbufs(struct slgt_info *info)
4598{
4599 free_rbufs(info, 0, info->rbuf_count - 1);
4600 info->rbuf_fill_index = 0;
4601 info->rbuf_fill_count = 0;
4602}
4603
4604/*
4605 * pass receive HDLC frame to upper layer
4606 *
4607 * return true if frame available, otherwise false
4608 */
4609static bool rx_get_frame(struct slgt_info *info)
4610{
4611 unsigned int start, end;
4612 unsigned short status;
4613 unsigned int framesize = 0;
4614 unsigned long flags;
4615 struct tty_struct *tty = info->port.tty;
4616 unsigned char addr_field = 0xff;
4617 unsigned int crc_size = 0;
4618
4619 switch (info->params.crc_type & HDLC_CRC_MASK) {
4620 case HDLC_CRC_16_CCITT: crc_size = 2; break;
4621 case HDLC_CRC_32_CCITT: crc_size = 4; break;
4622 }
4623
4624check_again:
4625
4626 framesize = 0;
4627 addr_field = 0xff;
4628 start = end = info->rbuf_current;
4629
4630 for (;;) {
4631 if (!desc_complete(info->rbufs[end]))
4632 goto cleanup;
4633
4634 if (framesize == 0 && info->params.addr_filter != 0xff)
4635 addr_field = info->rbufs[end].buf[0];
4636
4637 framesize += desc_count(info->rbufs[end]);
4638
4639 if (desc_eof(info->rbufs[end]))
4640 break;
4641
4642 if (++end == info->rbuf_count)
4643 end = 0;
4644
4645 if (end == info->rbuf_current) {
4646 if (info->rx_enabled){
4647 spin_lock_irqsave(&info->lock,flags);
4648 rx_start(info);
4649 spin_unlock_irqrestore(&info->lock,flags);
4650 }
4651 goto cleanup;
4652 }
4653 }
4654
4655 /* status
4656 *
4657 * 15 buffer complete
4658 * 14..06 reserved
4659 * 05..04 residue
4660 * 02 eof (end of frame)
4661 * 01 CRC error
4662 * 00 abort
4663 */
4664 status = desc_status(info->rbufs[end]);
4665
4666 /* ignore CRC bit if not using CRC (bit is undefined) */
4667 if ((info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_NONE)
4668 status &= ~BIT1;
4669
4670 if (framesize == 0 ||
4671 (addr_field != 0xff && addr_field != info->params.addr_filter)) {
4672 free_rbufs(info, start, end);
4673 goto check_again;
4674 }
4675
4676 if (framesize < (2 + crc_size) || status & BIT0) {
4677 info->icount.rxshort++;
4678 framesize = 0;
4679 } else if (status & BIT1) {
4680 info->icount.rxcrc++;
4681 if (!(info->params.crc_type & HDLC_CRC_RETURN_EX))
4682 framesize = 0;
4683 }
4684
4685#if SYNCLINK_GENERIC_HDLC
4686 if (framesize == 0) {
4687 info->netdev->stats.rx_errors++;
4688 info->netdev->stats.rx_frame_errors++;
4689 }
4690#endif
4691
4692 DBGBH(("%s rx frame status=%04X size=%d\n",
4693 info->device_name, status, framesize));
4694 DBGDATA(info, info->rbufs[start].buf, min_t(int, framesize, info->rbuf_fill_level), "rx");
4695
4696 if (framesize) {
4697 if (!(info->params.crc_type & HDLC_CRC_RETURN_EX)) {
4698 framesize -= crc_size;
4699 crc_size = 0;
4700 }
4701
4702 if (framesize > info->max_frame_size + crc_size)
4703 info->icount.rxlong++;
4704 else {
4705 /* copy dma buffer(s) to contiguous temp buffer */
4706 int copy_count = framesize;
4707 int i = start;
4708 unsigned char *p = info->tmp_rbuf;
4709 info->tmp_rbuf_count = framesize;
4710
4711 info->icount.rxok++;
4712
4713 while(copy_count) {
4714 int partial_count = min_t(int, copy_count, info->rbuf_fill_level);
4715 memcpy(p, info->rbufs[i].buf, partial_count);
4716 p += partial_count;
4717 copy_count -= partial_count;
4718 if (++i == info->rbuf_count)
4719 i = 0;
4720 }
4721
4722 if (info->params.crc_type & HDLC_CRC_RETURN_EX) {
4723 *p = (status & BIT1) ? RX_CRC_ERROR : RX_OK;
4724 framesize++;
4725 }
4726
4727#if SYNCLINK_GENERIC_HDLC
4728 if (info->netcount)
4729 hdlcdev_rx(info,info->tmp_rbuf, framesize);
4730 else
4731#endif
4732 ldisc_receive_buf(tty, info->tmp_rbuf, info->flag_buf, framesize);
4733 }
4734 }
4735 free_rbufs(info, start, end);
4736 return true;
4737
4738cleanup:
4739 return false;
4740}
4741
4742/*
4743 * pass receive buffer (RAW synchronous mode) to tty layer
4744 * return true if buffer available, otherwise false
4745 */
4746static bool rx_get_buf(struct slgt_info *info)
4747{
4748 unsigned int i = info->rbuf_current;
4749 unsigned int count;
4750
4751 if (!desc_complete(info->rbufs[i]))
4752 return false;
4753 count = desc_count(info->rbufs[i]);
4754 switch(info->params.mode) {
4755 case MGSL_MODE_MONOSYNC:
4756 case MGSL_MODE_BISYNC:
4757 case MGSL_MODE_XSYNC:
4758 /* ignore residue in byte synchronous modes */
4759 if (desc_residue(info->rbufs[i]))
4760 count--;
4761 break;
4762 }
4763 DBGDATA(info, info->rbufs[i].buf, count, "rx");
4764 DBGINFO(("rx_get_buf size=%d\n", count));
4765 if (count)
4766 ldisc_receive_buf(info->port.tty, info->rbufs[i].buf,
4767 info->flag_buf, count);
4768 free_rbufs(info, i, i);
4769 return true;
4770}
4771
4772static void reset_tbufs(struct slgt_info *info)
4773{
4774 unsigned int i;
4775 info->tbuf_current = 0;
4776 for (i=0 ; i < info->tbuf_count ; i++) {
4777 info->tbufs[i].status = 0;
4778 info->tbufs[i].count = 0;
4779 }
4780}
4781
4782/*
4783 * return number of free transmit DMA buffers
4784 */
4785static unsigned int free_tbuf_count(struct slgt_info *info)
4786{
4787 unsigned int count = 0;
4788 unsigned int i = info->tbuf_current;
4789
4790 do
4791 {
4792 if (desc_count(info->tbufs[i]))
4793 break; /* buffer in use */
4794 ++count;
4795 if (++i == info->tbuf_count)
4796 i=0;
4797 } while (i != info->tbuf_current);
4798
4799 /* if tx DMA active, last zero count buffer is in use */
4800 if (count && (rd_reg32(info, TDCSR) & BIT0))
4801 --count;
4802
4803 return count;
4804}
4805
4806/*
4807 * return number of bytes in unsent transmit DMA buffers
4808 * and the serial controller tx FIFO
4809 */
4810static unsigned int tbuf_bytes(struct slgt_info *info)
4811{
4812 unsigned int total_count = 0;
4813 unsigned int i = info->tbuf_current;
4814 unsigned int reg_value;
4815 unsigned int count;
4816 unsigned int active_buf_count = 0;
4817
4818 /*
4819 * Add descriptor counts for all tx DMA buffers.
4820 * If count is zero (cleared by DMA controller after read),
4821 * the buffer is complete or is actively being read from.
4822 *
4823 * Record buf_count of last buffer with zero count starting
4824 * from current ring position. buf_count is mirror
4825 * copy of count and is not cleared by serial controller.
4826 * If DMA controller is active, that buffer is actively
4827 * being read so add to total.
4828 */
4829 do {
4830 count = desc_count(info->tbufs[i]);
4831 if (count)
4832 total_count += count;
4833 else if (!total_count)
4834 active_buf_count = info->tbufs[i].buf_count;
4835 if (++i == info->tbuf_count)
4836 i = 0;
4837 } while (i != info->tbuf_current);
4838
4839 /* read tx DMA status register */
4840 reg_value = rd_reg32(info, TDCSR);
4841
4842 /* if tx DMA active, last zero count buffer is in use */
4843 if (reg_value & BIT0)
4844 total_count += active_buf_count;
4845
4846 /* add tx FIFO count = reg_value[15..8] */
4847 total_count += (reg_value >> 8) & 0xff;
4848
4849 /* if transmitter active add one byte for shift register */
4850 if (info->tx_active)
4851 total_count++;
4852
4853 return total_count;
4854}
4855
4856/*
4857 * load data into transmit DMA buffer ring and start transmitter if needed
4858 * return true if data accepted, otherwise false (buffers full)
4859 */
4860static bool tx_load(struct slgt_info *info, const char *buf, unsigned int size)
4861{
4862 unsigned short count;
4863 unsigned int i;
4864 struct slgt_desc *d;
4865
4866 /* check required buffer space */
4867 if (DIV_ROUND_UP(size, DMABUFSIZE) > free_tbuf_count(info))
4868 return false;
4869
4870 DBGDATA(info, buf, size, "tx");
4871
4872 /*
4873 * copy data to one or more DMA buffers in circular ring
4874 * tbuf_start = first buffer for this data
4875 * tbuf_current = next free buffer
4876 *
4877 * Copy all data before making data visible to DMA controller by
4878 * setting descriptor count of the first buffer.
4879 * This prevents an active DMA controller from reading the first DMA
4880 * buffers of a frame and stopping before the final buffers are filled.
4881 */
4882
4883 info->tbuf_start = i = info->tbuf_current;
4884
4885 while (size) {
4886 d = &info->tbufs[i];
4887
4888 count = (unsigned short)((size > DMABUFSIZE) ? DMABUFSIZE : size);
4889 memcpy(d->buf, buf, count);
4890
4891 size -= count;
4892 buf += count;
4893
4894 /*
4895 * set EOF bit for last buffer of HDLC frame or
4896 * for every buffer in raw mode
4897 */
4898 if ((!size && info->params.mode == MGSL_MODE_HDLC) ||
4899 info->params.mode == MGSL_MODE_RAW)
4900 set_desc_eof(*d, 1);
4901 else
4902 set_desc_eof(*d, 0);
4903
4904 /* set descriptor count for all but first buffer */
4905 if (i != info->tbuf_start)
4906 set_desc_count(*d, count);
4907 d->buf_count = count;
4908
4909 if (++i == info->tbuf_count)
4910 i = 0;
4911 }
4912
4913 info->tbuf_current = i;
4914
4915 /* set first buffer count to make new data visible to DMA controller */
4916 d = &info->tbufs[info->tbuf_start];
4917 set_desc_count(*d, d->buf_count);
4918
4919 /* start transmitter if needed and update transmit timeout */
4920 if (!info->tx_active)
4921 tx_start(info);
4922 update_tx_timer(info);
4923
4924 return true;
4925}
4926
4927static int register_test(struct slgt_info *info)
4928{
4929 static unsigned short patterns[] =
4930 {0x0000, 0xffff, 0xaaaa, 0x5555, 0x6969, 0x9696};
4931 static unsigned int count = ARRAY_SIZE(patterns);
4932 unsigned int i;
4933 int rc = 0;
4934
4935 for (i=0 ; i < count ; i++) {
4936 wr_reg16(info, TIR, patterns[i]);
4937 wr_reg16(info, BDR, patterns[(i+1)%count]);
4938 if ((rd_reg16(info, TIR) != patterns[i]) ||
4939 (rd_reg16(info, BDR) != patterns[(i+1)%count])) {
4940 rc = -ENODEV;
4941 break;
4942 }
4943 }
4944 info->gpio_present = (rd_reg32(info, JCR) & BIT5) ? 1 : 0;
4945 info->init_error = rc ? 0 : DiagStatus_AddressFailure;
4946 return rc;
4947}
4948
4949static int irq_test(struct slgt_info *info)
4950{
4951 unsigned long timeout;
4952 unsigned long flags;
4953 struct tty_struct *oldtty = info->port.tty;
4954 u32 speed = info->params.data_rate;
4955
4956 info->params.data_rate = 921600;
4957 info->port.tty = NULL;
4958
4959 spin_lock_irqsave(&info->lock, flags);
4960 async_mode(info);
4961 slgt_irq_on(info, IRQ_TXIDLE);
4962
4963 /* enable transmitter */
4964 wr_reg16(info, TCR,
4965 (unsigned short)(rd_reg16(info, TCR) | BIT1));
4966
4967 /* write one byte and wait for tx idle */
4968 wr_reg16(info, TDR, 0);
4969
4970 /* assume failure */
4971 info->init_error = DiagStatus_IrqFailure;
4972 info->irq_occurred = false;
4973
4974 spin_unlock_irqrestore(&info->lock, flags);
4975
4976 timeout=100;
4977 while(timeout-- && !info->irq_occurred)
4978 msleep_interruptible(10);
4979
4980 spin_lock_irqsave(&info->lock,flags);
4981 reset_port(info);
4982 spin_unlock_irqrestore(&info->lock,flags);
4983
4984 info->params.data_rate = speed;
4985 info->port.tty = oldtty;
4986
4987 info->init_error = info->irq_occurred ? 0 : DiagStatus_IrqFailure;
4988 return info->irq_occurred ? 0 : -ENODEV;
4989}
4990
4991static int loopback_test_rx(struct slgt_info *info)
4992{
4993 unsigned char *src, *dest;
4994 int count;
4995
4996 if (desc_complete(info->rbufs[0])) {
4997 count = desc_count(info->rbufs[0]);
4998 src = info->rbufs[0].buf;
4999 dest = info->tmp_rbuf;
5000
5001 for( ; count ; count-=2, src+=2) {
5002 /* src=data byte (src+1)=status byte */
5003 if (!(*(src+1) & (BIT9 + BIT8))) {
5004 *dest = *src;
5005 dest++;
5006 info->tmp_rbuf_count++;
5007 }
5008 }
5009 DBGDATA(info, info->tmp_rbuf, info->tmp_rbuf_count, "rx");
5010 return 1;
5011 }
5012 return 0;
5013}
5014
5015static int loopback_test(struct slgt_info *info)
5016{
5017#define TESTFRAMESIZE 20
5018
5019 unsigned long timeout;
5020 u16 count = TESTFRAMESIZE;
5021 unsigned char buf[TESTFRAMESIZE];
5022 int rc = -ENODEV;
5023 unsigned long flags;
5024
5025 struct tty_struct *oldtty = info->port.tty;
5026 MGSL_PARAMS params;
5027
5028 memcpy(¶ms, &info->params, sizeof(params));
5029
5030 info->params.mode = MGSL_MODE_ASYNC;
5031 info->params.data_rate = 921600;
5032 info->params.loopback = 1;
5033 info->port.tty = NULL;
5034
5035 /* build and send transmit frame */
5036 for (count = 0; count < TESTFRAMESIZE; ++count)
5037 buf[count] = (unsigned char)count;
5038
5039 info->tmp_rbuf_count = 0;
5040 memset(info->tmp_rbuf, 0, TESTFRAMESIZE);
5041
5042 /* program hardware for HDLC and enabled receiver */
5043 spin_lock_irqsave(&info->lock,flags);
5044 async_mode(info);
5045 rx_start(info);
5046 tx_load(info, buf, count);
5047 spin_unlock_irqrestore(&info->lock, flags);
5048
5049 /* wait for receive complete */
5050 for (timeout = 100; timeout; --timeout) {
5051 msleep_interruptible(10);
5052 if (loopback_test_rx(info)) {
5053 rc = 0;
5054 break;
5055 }
5056 }
5057
5058 /* verify received frame length and contents */
5059 if (!rc && (info->tmp_rbuf_count != count ||
5060 memcmp(buf, info->tmp_rbuf, count))) {
5061 rc = -ENODEV;
5062 }
5063
5064 spin_lock_irqsave(&info->lock,flags);
5065 reset_adapter(info);
5066 spin_unlock_irqrestore(&info->lock,flags);
5067
5068 memcpy(&info->params, ¶ms, sizeof(info->params));
5069 info->port.tty = oldtty;
5070
5071 info->init_error = rc ? DiagStatus_DmaFailure : 0;
5072 return rc;
5073}
5074
5075static int adapter_test(struct slgt_info *info)
5076{
5077 DBGINFO(("testing %s\n", info->device_name));
5078 if (register_test(info) < 0) {
5079 printk("register test failure %s addr=%08X\n",
5080 info->device_name, info->phys_reg_addr);
5081 } else if (irq_test(info) < 0) {
5082 printk("IRQ test failure %s IRQ=%d\n",
5083 info->device_name, info->irq_level);
5084 } else if (loopback_test(info) < 0) {
5085 printk("loopback test failure %s\n", info->device_name);
5086 }
5087 return info->init_error;
5088}
5089
5090/*
5091 * transmit timeout handler
5092 */
5093static void tx_timeout(struct timer_list *t)
5094{
5095 struct slgt_info *info = from_timer(info, t, tx_timer);
5096 unsigned long flags;
5097
5098 DBGINFO(("%s tx_timeout\n", info->device_name));
5099 if(info->tx_active && info->params.mode == MGSL_MODE_HDLC) {
5100 info->icount.txtimeout++;
5101 }
5102 spin_lock_irqsave(&info->lock,flags);
5103 tx_stop(info);
5104 spin_unlock_irqrestore(&info->lock,flags);
5105
5106#if SYNCLINK_GENERIC_HDLC
5107 if (info->netcount)
5108 hdlcdev_tx_done(info);
5109 else
5110#endif
5111 bh_transmit(info);
5112}
5113
5114/*
5115 * receive buffer polling timer
5116 */
5117static void rx_timeout(struct timer_list *t)
5118{
5119 struct slgt_info *info = from_timer(info, t, rx_timer);
5120 unsigned long flags;
5121
5122 DBGINFO(("%s rx_timeout\n", info->device_name));
5123 spin_lock_irqsave(&info->lock, flags);
5124 info->pending_bh |= BH_RECEIVE;
5125 spin_unlock_irqrestore(&info->lock, flags);
5126 bh_handler(&info->task);
5127}
5128
1/*
2 * Device driver for Microgate SyncLink GT serial adapters.
3 *
4 * written by Paul Fulghum for Microgate Corporation
5 * paulkf@microgate.com
6 *
7 * Microgate and SyncLink are trademarks of Microgate Corporation
8 *
9 * This code is released under the GNU General Public License (GPL)
10 *
11 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
12 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
13 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
14 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
15 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
16 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
17 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
18 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
19 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
20 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
21 * OF THE POSSIBILITY OF SUCH DAMAGE.
22 */
23
24/*
25 * DEBUG OUTPUT DEFINITIONS
26 *
27 * uncomment lines below to enable specific types of debug output
28 *
29 * DBGINFO information - most verbose output
30 * DBGERR serious errors
31 * DBGBH bottom half service routine debugging
32 * DBGISR interrupt service routine debugging
33 * DBGDATA output receive and transmit data
34 * DBGTBUF output transmit DMA buffers and registers
35 * DBGRBUF output receive DMA buffers and registers
36 */
37
38#define DBGINFO(fmt) if (debug_level >= DEBUG_LEVEL_INFO) printk fmt
39#define DBGERR(fmt) if (debug_level >= DEBUG_LEVEL_ERROR) printk fmt
40#define DBGBH(fmt) if (debug_level >= DEBUG_LEVEL_BH) printk fmt
41#define DBGISR(fmt) if (debug_level >= DEBUG_LEVEL_ISR) printk fmt
42#define DBGDATA(info, buf, size, label) if (debug_level >= DEBUG_LEVEL_DATA) trace_block((info), (buf), (size), (label))
43/*#define DBGTBUF(info) dump_tbufs(info)*/
44/*#define DBGRBUF(info) dump_rbufs(info)*/
45
46
47#include <linux/module.h>
48#include <linux/errno.h>
49#include <linux/signal.h>
50#include <linux/sched.h>
51#include <linux/timer.h>
52#include <linux/interrupt.h>
53#include <linux/pci.h>
54#include <linux/tty.h>
55#include <linux/tty_flip.h>
56#include <linux/serial.h>
57#include <linux/major.h>
58#include <linux/string.h>
59#include <linux/fcntl.h>
60#include <linux/ptrace.h>
61#include <linux/ioport.h>
62#include <linux/mm.h>
63#include <linux/seq_file.h>
64#include <linux/slab.h>
65#include <linux/netdevice.h>
66#include <linux/vmalloc.h>
67#include <linux/init.h>
68#include <linux/delay.h>
69#include <linux/ioctl.h>
70#include <linux/termios.h>
71#include <linux/bitops.h>
72#include <linux/workqueue.h>
73#include <linux/hdlc.h>
74#include <linux/synclink.h>
75
76#include <asm/io.h>
77#include <asm/irq.h>
78#include <asm/dma.h>
79#include <asm/types.h>
80#include <asm/uaccess.h>
81
82#if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINK_GT_MODULE))
83#define SYNCLINK_GENERIC_HDLC 1
84#else
85#define SYNCLINK_GENERIC_HDLC 0
86#endif
87
88/*
89 * module identification
90 */
91static char *driver_name = "SyncLink GT";
92static char *slgt_driver_name = "synclink_gt";
93static char *tty_dev_prefix = "ttySLG";
94MODULE_LICENSE("GPL");
95#define MGSL_MAGIC 0x5401
96#define MAX_DEVICES 32
97
98static struct pci_device_id pci_table[] = {
99 {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
100 {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT2_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
101 {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT4_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
102 {PCI_VENDOR_ID_MICROGATE, SYNCLINK_AC_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
103 {0,}, /* terminate list */
104};
105MODULE_DEVICE_TABLE(pci, pci_table);
106
107static int init_one(struct pci_dev *dev,const struct pci_device_id *ent);
108static void remove_one(struct pci_dev *dev);
109static struct pci_driver pci_driver = {
110 .name = "synclink_gt",
111 .id_table = pci_table,
112 .probe = init_one,
113 .remove = remove_one,
114};
115
116static bool pci_registered;
117
118/*
119 * module configuration and status
120 */
121static struct slgt_info *slgt_device_list;
122static int slgt_device_count;
123
124static int ttymajor;
125static int debug_level;
126static int maxframe[MAX_DEVICES];
127
128module_param(ttymajor, int, 0);
129module_param(debug_level, int, 0);
130module_param_array(maxframe, int, NULL, 0);
131
132MODULE_PARM_DESC(ttymajor, "TTY major device number override: 0=auto assigned");
133MODULE_PARM_DESC(debug_level, "Debug syslog output: 0=disabled, 1 to 5=increasing detail");
134MODULE_PARM_DESC(maxframe, "Maximum frame size used by device (4096 to 65535)");
135
136/*
137 * tty support and callbacks
138 */
139static struct tty_driver *serial_driver;
140
141static int open(struct tty_struct *tty, struct file * filp);
142static void close(struct tty_struct *tty, struct file * filp);
143static void hangup(struct tty_struct *tty);
144static void set_termios(struct tty_struct *tty, struct ktermios *old_termios);
145
146static int write(struct tty_struct *tty, const unsigned char *buf, int count);
147static int put_char(struct tty_struct *tty, unsigned char ch);
148static void send_xchar(struct tty_struct *tty, char ch);
149static void wait_until_sent(struct tty_struct *tty, int timeout);
150static int write_room(struct tty_struct *tty);
151static void flush_chars(struct tty_struct *tty);
152static void flush_buffer(struct tty_struct *tty);
153static void tx_hold(struct tty_struct *tty);
154static void tx_release(struct tty_struct *tty);
155
156static int ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg);
157static int chars_in_buffer(struct tty_struct *tty);
158static void throttle(struct tty_struct * tty);
159static void unthrottle(struct tty_struct * tty);
160static int set_break(struct tty_struct *tty, int break_state);
161
162/*
163 * generic HDLC support and callbacks
164 */
165#if SYNCLINK_GENERIC_HDLC
166#define dev_to_port(D) (dev_to_hdlc(D)->priv)
167static void hdlcdev_tx_done(struct slgt_info *info);
168static void hdlcdev_rx(struct slgt_info *info, char *buf, int size);
169static int hdlcdev_init(struct slgt_info *info);
170static void hdlcdev_exit(struct slgt_info *info);
171#endif
172
173
174/*
175 * device specific structures, macros and functions
176 */
177
178#define SLGT_MAX_PORTS 4
179#define SLGT_REG_SIZE 256
180
181/*
182 * conditional wait facility
183 */
184struct cond_wait {
185 struct cond_wait *next;
186 wait_queue_head_t q;
187 wait_queue_t wait;
188 unsigned int data;
189};
190static void init_cond_wait(struct cond_wait *w, unsigned int data);
191static void add_cond_wait(struct cond_wait **head, struct cond_wait *w);
192static void remove_cond_wait(struct cond_wait **head, struct cond_wait *w);
193static void flush_cond_wait(struct cond_wait **head);
194
195/*
196 * DMA buffer descriptor and access macros
197 */
198struct slgt_desc
199{
200 __le16 count;
201 __le16 status;
202 __le32 pbuf; /* physical address of data buffer */
203 __le32 next; /* physical address of next descriptor */
204
205 /* driver book keeping */
206 char *buf; /* virtual address of data buffer */
207 unsigned int pdesc; /* physical address of this descriptor */
208 dma_addr_t buf_dma_addr;
209 unsigned short buf_count;
210};
211
212#define set_desc_buffer(a,b) (a).pbuf = cpu_to_le32((unsigned int)(b))
213#define set_desc_next(a,b) (a).next = cpu_to_le32((unsigned int)(b))
214#define set_desc_count(a,b)(a).count = cpu_to_le16((unsigned short)(b))
215#define set_desc_eof(a,b) (a).status = cpu_to_le16((b) ? (le16_to_cpu((a).status) | BIT0) : (le16_to_cpu((a).status) & ~BIT0))
216#define set_desc_status(a, b) (a).status = cpu_to_le16((unsigned short)(b))
217#define desc_count(a) (le16_to_cpu((a).count))
218#define desc_status(a) (le16_to_cpu((a).status))
219#define desc_complete(a) (le16_to_cpu((a).status) & BIT15)
220#define desc_eof(a) (le16_to_cpu((a).status) & BIT2)
221#define desc_crc_error(a) (le16_to_cpu((a).status) & BIT1)
222#define desc_abort(a) (le16_to_cpu((a).status) & BIT0)
223#define desc_residue(a) ((le16_to_cpu((a).status) & 0x38) >> 3)
224
225struct _input_signal_events {
226 int ri_up;
227 int ri_down;
228 int dsr_up;
229 int dsr_down;
230 int dcd_up;
231 int dcd_down;
232 int cts_up;
233 int cts_down;
234};
235
236/*
237 * device instance data structure
238 */
239struct slgt_info {
240 void *if_ptr; /* General purpose pointer (used by SPPP) */
241 struct tty_port port;
242
243 struct slgt_info *next_device; /* device list link */
244
245 int magic;
246
247 char device_name[25];
248 struct pci_dev *pdev;
249
250 int port_count; /* count of ports on adapter */
251 int adapter_num; /* adapter instance number */
252 int port_num; /* port instance number */
253
254 /* array of pointers to port contexts on this adapter */
255 struct slgt_info *port_array[SLGT_MAX_PORTS];
256
257 int line; /* tty line instance number */
258
259 struct mgsl_icount icount;
260
261 int timeout;
262 int x_char; /* xon/xoff character */
263 unsigned int read_status_mask;
264 unsigned int ignore_status_mask;
265
266 wait_queue_head_t status_event_wait_q;
267 wait_queue_head_t event_wait_q;
268 struct timer_list tx_timer;
269 struct timer_list rx_timer;
270
271 unsigned int gpio_present;
272 struct cond_wait *gpio_wait_q;
273
274 spinlock_t lock; /* spinlock for synchronizing with ISR */
275
276 struct work_struct task;
277 u32 pending_bh;
278 bool bh_requested;
279 bool bh_running;
280
281 int isr_overflow;
282 bool irq_requested; /* true if IRQ requested */
283 bool irq_occurred; /* for diagnostics use */
284
285 /* device configuration */
286
287 unsigned int bus_type;
288 unsigned int irq_level;
289 unsigned long irq_flags;
290
291 unsigned char __iomem * reg_addr; /* memory mapped registers address */
292 u32 phys_reg_addr;
293 bool reg_addr_requested;
294
295 MGSL_PARAMS params; /* communications parameters */
296 u32 idle_mode;
297 u32 max_frame_size; /* as set by device config */
298
299 unsigned int rbuf_fill_level;
300 unsigned int rx_pio;
301 unsigned int if_mode;
302 unsigned int base_clock;
303 unsigned int xsync;
304 unsigned int xctrl;
305
306 /* device status */
307
308 bool rx_enabled;
309 bool rx_restart;
310
311 bool tx_enabled;
312 bool tx_active;
313
314 unsigned char signals; /* serial signal states */
315 int init_error; /* initialization error */
316
317 unsigned char *tx_buf;
318 int tx_count;
319
320 char *flag_buf;
321 bool drop_rts_on_tx_done;
322 struct _input_signal_events input_signal_events;
323
324 int dcd_chkcount; /* check counts to prevent */
325 int cts_chkcount; /* too many IRQs if a signal */
326 int dsr_chkcount; /* is floating */
327 int ri_chkcount;
328
329 char *bufs; /* virtual address of DMA buffer lists */
330 dma_addr_t bufs_dma_addr; /* physical address of buffer descriptors */
331
332 unsigned int rbuf_count;
333 struct slgt_desc *rbufs;
334 unsigned int rbuf_current;
335 unsigned int rbuf_index;
336 unsigned int rbuf_fill_index;
337 unsigned short rbuf_fill_count;
338
339 unsigned int tbuf_count;
340 struct slgt_desc *tbufs;
341 unsigned int tbuf_current;
342 unsigned int tbuf_start;
343
344 unsigned char *tmp_rbuf;
345 unsigned int tmp_rbuf_count;
346
347 /* SPPP/Cisco HDLC device parts */
348
349 int netcount;
350 spinlock_t netlock;
351#if SYNCLINK_GENERIC_HDLC
352 struct net_device *netdev;
353#endif
354
355};
356
357static MGSL_PARAMS default_params = {
358 .mode = MGSL_MODE_HDLC,
359 .loopback = 0,
360 .flags = HDLC_FLAG_UNDERRUN_ABORT15,
361 .encoding = HDLC_ENCODING_NRZI_SPACE,
362 .clock_speed = 0,
363 .addr_filter = 0xff,
364 .crc_type = HDLC_CRC_16_CCITT,
365 .preamble_length = HDLC_PREAMBLE_LENGTH_8BITS,
366 .preamble = HDLC_PREAMBLE_PATTERN_NONE,
367 .data_rate = 9600,
368 .data_bits = 8,
369 .stop_bits = 1,
370 .parity = ASYNC_PARITY_NONE
371};
372
373
374#define BH_RECEIVE 1
375#define BH_TRANSMIT 2
376#define BH_STATUS 4
377#define IO_PIN_SHUTDOWN_LIMIT 100
378
379#define DMABUFSIZE 256
380#define DESC_LIST_SIZE 4096
381
382#define MASK_PARITY BIT1
383#define MASK_FRAMING BIT0
384#define MASK_BREAK BIT14
385#define MASK_OVERRUN BIT4
386
387#define GSR 0x00 /* global status */
388#define JCR 0x04 /* JTAG control */
389#define IODR 0x08 /* GPIO direction */
390#define IOER 0x0c /* GPIO interrupt enable */
391#define IOVR 0x10 /* GPIO value */
392#define IOSR 0x14 /* GPIO interrupt status */
393#define TDR 0x80 /* tx data */
394#define RDR 0x80 /* rx data */
395#define TCR 0x82 /* tx control */
396#define TIR 0x84 /* tx idle */
397#define TPR 0x85 /* tx preamble */
398#define RCR 0x86 /* rx control */
399#define VCR 0x88 /* V.24 control */
400#define CCR 0x89 /* clock control */
401#define BDR 0x8a /* baud divisor */
402#define SCR 0x8c /* serial control */
403#define SSR 0x8e /* serial status */
404#define RDCSR 0x90 /* rx DMA control/status */
405#define TDCSR 0x94 /* tx DMA control/status */
406#define RDDAR 0x98 /* rx DMA descriptor address */
407#define TDDAR 0x9c /* tx DMA descriptor address */
408#define XSR 0x40 /* extended sync pattern */
409#define XCR 0x44 /* extended control */
410
411#define RXIDLE BIT14
412#define RXBREAK BIT14
413#define IRQ_TXDATA BIT13
414#define IRQ_TXIDLE BIT12
415#define IRQ_TXUNDER BIT11 /* HDLC */
416#define IRQ_RXDATA BIT10
417#define IRQ_RXIDLE BIT9 /* HDLC */
418#define IRQ_RXBREAK BIT9 /* async */
419#define IRQ_RXOVER BIT8
420#define IRQ_DSR BIT7
421#define IRQ_CTS BIT6
422#define IRQ_DCD BIT5
423#define IRQ_RI BIT4
424#define IRQ_ALL 0x3ff0
425#define IRQ_MASTER BIT0
426
427#define slgt_irq_on(info, mask) \
428 wr_reg16((info), SCR, (unsigned short)(rd_reg16((info), SCR) | (mask)))
429#define slgt_irq_off(info, mask) \
430 wr_reg16((info), SCR, (unsigned short)(rd_reg16((info), SCR) & ~(mask)))
431
432static __u8 rd_reg8(struct slgt_info *info, unsigned int addr);
433static void wr_reg8(struct slgt_info *info, unsigned int addr, __u8 value);
434static __u16 rd_reg16(struct slgt_info *info, unsigned int addr);
435static void wr_reg16(struct slgt_info *info, unsigned int addr, __u16 value);
436static __u32 rd_reg32(struct slgt_info *info, unsigned int addr);
437static void wr_reg32(struct slgt_info *info, unsigned int addr, __u32 value);
438
439static void msc_set_vcr(struct slgt_info *info);
440
441static int startup(struct slgt_info *info);
442static int block_til_ready(struct tty_struct *tty, struct file * filp,struct slgt_info *info);
443static void shutdown(struct slgt_info *info);
444static void program_hw(struct slgt_info *info);
445static void change_params(struct slgt_info *info);
446
447static int register_test(struct slgt_info *info);
448static int irq_test(struct slgt_info *info);
449static int loopback_test(struct slgt_info *info);
450static int adapter_test(struct slgt_info *info);
451
452static void reset_adapter(struct slgt_info *info);
453static void reset_port(struct slgt_info *info);
454static void async_mode(struct slgt_info *info);
455static void sync_mode(struct slgt_info *info);
456
457static void rx_stop(struct slgt_info *info);
458static void rx_start(struct slgt_info *info);
459static void reset_rbufs(struct slgt_info *info);
460static void free_rbufs(struct slgt_info *info, unsigned int first, unsigned int last);
461static void rdma_reset(struct slgt_info *info);
462static bool rx_get_frame(struct slgt_info *info);
463static bool rx_get_buf(struct slgt_info *info);
464
465static void tx_start(struct slgt_info *info);
466static void tx_stop(struct slgt_info *info);
467static void tx_set_idle(struct slgt_info *info);
468static unsigned int free_tbuf_count(struct slgt_info *info);
469static unsigned int tbuf_bytes(struct slgt_info *info);
470static void reset_tbufs(struct slgt_info *info);
471static void tdma_reset(struct slgt_info *info);
472static bool tx_load(struct slgt_info *info, const char *buf, unsigned int count);
473
474static void get_signals(struct slgt_info *info);
475static void set_signals(struct slgt_info *info);
476static void enable_loopback(struct slgt_info *info);
477static void set_rate(struct slgt_info *info, u32 data_rate);
478
479static int bh_action(struct slgt_info *info);
480static void bh_handler(struct work_struct *work);
481static void bh_transmit(struct slgt_info *info);
482static void isr_serial(struct slgt_info *info);
483static void isr_rdma(struct slgt_info *info);
484static void isr_txeom(struct slgt_info *info, unsigned short status);
485static void isr_tdma(struct slgt_info *info);
486
487static int alloc_dma_bufs(struct slgt_info *info);
488static void free_dma_bufs(struct slgt_info *info);
489static int alloc_desc(struct slgt_info *info);
490static void free_desc(struct slgt_info *info);
491static int alloc_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count);
492static void free_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count);
493
494static int alloc_tmp_rbuf(struct slgt_info *info);
495static void free_tmp_rbuf(struct slgt_info *info);
496
497static void tx_timeout(unsigned long context);
498static void rx_timeout(unsigned long context);
499
500/*
501 * ioctl handlers
502 */
503static int get_stats(struct slgt_info *info, struct mgsl_icount __user *user_icount);
504static int get_params(struct slgt_info *info, MGSL_PARAMS __user *params);
505static int set_params(struct slgt_info *info, MGSL_PARAMS __user *params);
506static int get_txidle(struct slgt_info *info, int __user *idle_mode);
507static int set_txidle(struct slgt_info *info, int idle_mode);
508static int tx_enable(struct slgt_info *info, int enable);
509static int tx_abort(struct slgt_info *info);
510static int rx_enable(struct slgt_info *info, int enable);
511static int modem_input_wait(struct slgt_info *info,int arg);
512static int wait_mgsl_event(struct slgt_info *info, int __user *mask_ptr);
513static int tiocmget(struct tty_struct *tty);
514static int tiocmset(struct tty_struct *tty,
515 unsigned int set, unsigned int clear);
516static int set_break(struct tty_struct *tty, int break_state);
517static int get_interface(struct slgt_info *info, int __user *if_mode);
518static int set_interface(struct slgt_info *info, int if_mode);
519static int set_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
520static int get_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
521static int wait_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
522static int get_xsync(struct slgt_info *info, int __user *if_mode);
523static int set_xsync(struct slgt_info *info, int if_mode);
524static int get_xctrl(struct slgt_info *info, int __user *if_mode);
525static int set_xctrl(struct slgt_info *info, int if_mode);
526
527/*
528 * driver functions
529 */
530static void add_device(struct slgt_info *info);
531static void device_init(int adapter_num, struct pci_dev *pdev);
532static int claim_resources(struct slgt_info *info);
533static void release_resources(struct slgt_info *info);
534
535/*
536 * DEBUG OUTPUT CODE
537 */
538#ifndef DBGINFO
539#define DBGINFO(fmt)
540#endif
541#ifndef DBGERR
542#define DBGERR(fmt)
543#endif
544#ifndef DBGBH
545#define DBGBH(fmt)
546#endif
547#ifndef DBGISR
548#define DBGISR(fmt)
549#endif
550
551#ifdef DBGDATA
552static void trace_block(struct slgt_info *info, const char *data, int count, const char *label)
553{
554 int i;
555 int linecount;
556 printk("%s %s data:\n",info->device_name, label);
557 while(count) {
558 linecount = (count > 16) ? 16 : count;
559 for(i=0; i < linecount; i++)
560 printk("%02X ",(unsigned char)data[i]);
561 for(;i<17;i++)
562 printk(" ");
563 for(i=0;i<linecount;i++) {
564 if (data[i]>=040 && data[i]<=0176)
565 printk("%c",data[i]);
566 else
567 printk(".");
568 }
569 printk("\n");
570 data += linecount;
571 count -= linecount;
572 }
573}
574#else
575#define DBGDATA(info, buf, size, label)
576#endif
577
578#ifdef DBGTBUF
579static void dump_tbufs(struct slgt_info *info)
580{
581 int i;
582 printk("tbuf_current=%d\n", info->tbuf_current);
583 for (i=0 ; i < info->tbuf_count ; i++) {
584 printk("%d: count=%04X status=%04X\n",
585 i, le16_to_cpu(info->tbufs[i].count), le16_to_cpu(info->tbufs[i].status));
586 }
587}
588#else
589#define DBGTBUF(info)
590#endif
591
592#ifdef DBGRBUF
593static void dump_rbufs(struct slgt_info *info)
594{
595 int i;
596 printk("rbuf_current=%d\n", info->rbuf_current);
597 for (i=0 ; i < info->rbuf_count ; i++) {
598 printk("%d: count=%04X status=%04X\n",
599 i, le16_to_cpu(info->rbufs[i].count), le16_to_cpu(info->rbufs[i].status));
600 }
601}
602#else
603#define DBGRBUF(info)
604#endif
605
606static inline int sanity_check(struct slgt_info *info, char *devname, const char *name)
607{
608#ifdef SANITY_CHECK
609 if (!info) {
610 printk("null struct slgt_info for (%s) in %s\n", devname, name);
611 return 1;
612 }
613 if (info->magic != MGSL_MAGIC) {
614 printk("bad magic number struct slgt_info (%s) in %s\n", devname, name);
615 return 1;
616 }
617#else
618 if (!info)
619 return 1;
620#endif
621 return 0;
622}
623
624/**
625 * line discipline callback wrappers
626 *
627 * The wrappers maintain line discipline references
628 * while calling into the line discipline.
629 *
630 * ldisc_receive_buf - pass receive data to line discipline
631 */
632static void ldisc_receive_buf(struct tty_struct *tty,
633 const __u8 *data, char *flags, int count)
634{
635 struct tty_ldisc *ld;
636 if (!tty)
637 return;
638 ld = tty_ldisc_ref(tty);
639 if (ld) {
640 if (ld->ops->receive_buf)
641 ld->ops->receive_buf(tty, data, flags, count);
642 tty_ldisc_deref(ld);
643 }
644}
645
646/* tty callbacks */
647
648static int open(struct tty_struct *tty, struct file *filp)
649{
650 struct slgt_info *info;
651 int retval, line;
652 unsigned long flags;
653
654 line = tty->index;
655 if (line >= slgt_device_count) {
656 DBGERR(("%s: open with invalid line #%d.\n", driver_name, line));
657 return -ENODEV;
658 }
659
660 info = slgt_device_list;
661 while(info && info->line != line)
662 info = info->next_device;
663 if (sanity_check(info, tty->name, "open"))
664 return -ENODEV;
665 if (info->init_error) {
666 DBGERR(("%s init error=%d\n", info->device_name, info->init_error));
667 return -ENODEV;
668 }
669
670 tty->driver_data = info;
671 info->port.tty = tty;
672
673 DBGINFO(("%s open, old ref count = %d\n", info->device_name, info->port.count));
674
675 mutex_lock(&info->port.mutex);
676 info->port.low_latency = (info->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0;
677
678 spin_lock_irqsave(&info->netlock, flags);
679 if (info->netcount) {
680 retval = -EBUSY;
681 spin_unlock_irqrestore(&info->netlock, flags);
682 mutex_unlock(&info->port.mutex);
683 goto cleanup;
684 }
685 info->port.count++;
686 spin_unlock_irqrestore(&info->netlock, flags);
687
688 if (info->port.count == 1) {
689 /* 1st open on this device, init hardware */
690 retval = startup(info);
691 if (retval < 0) {
692 mutex_unlock(&info->port.mutex);
693 goto cleanup;
694 }
695 }
696 mutex_unlock(&info->port.mutex);
697 retval = block_til_ready(tty, filp, info);
698 if (retval) {
699 DBGINFO(("%s block_til_ready rc=%d\n", info->device_name, retval));
700 goto cleanup;
701 }
702
703 retval = 0;
704
705cleanup:
706 if (retval) {
707 if (tty->count == 1)
708 info->port.tty = NULL; /* tty layer will release tty struct */
709 if(info->port.count)
710 info->port.count--;
711 }
712
713 DBGINFO(("%s open rc=%d\n", info->device_name, retval));
714 return retval;
715}
716
717static void close(struct tty_struct *tty, struct file *filp)
718{
719 struct slgt_info *info = tty->driver_data;
720
721 if (sanity_check(info, tty->name, "close"))
722 return;
723 DBGINFO(("%s close entry, count=%d\n", info->device_name, info->port.count));
724
725 if (tty_port_close_start(&info->port, tty, filp) == 0)
726 goto cleanup;
727
728 mutex_lock(&info->port.mutex);
729 if (info->port.flags & ASYNC_INITIALIZED)
730 wait_until_sent(tty, info->timeout);
731 flush_buffer(tty);
732 tty_ldisc_flush(tty);
733
734 shutdown(info);
735 mutex_unlock(&info->port.mutex);
736
737 tty_port_close_end(&info->port, tty);
738 info->port.tty = NULL;
739cleanup:
740 DBGINFO(("%s close exit, count=%d\n", tty->driver->name, info->port.count));
741}
742
743static void hangup(struct tty_struct *tty)
744{
745 struct slgt_info *info = tty->driver_data;
746 unsigned long flags;
747
748 if (sanity_check(info, tty->name, "hangup"))
749 return;
750 DBGINFO(("%s hangup\n", info->device_name));
751
752 flush_buffer(tty);
753
754 mutex_lock(&info->port.mutex);
755 shutdown(info);
756
757 spin_lock_irqsave(&info->port.lock, flags);
758 info->port.count = 0;
759 info->port.flags &= ~ASYNC_NORMAL_ACTIVE;
760 info->port.tty = NULL;
761 spin_unlock_irqrestore(&info->port.lock, flags);
762 mutex_unlock(&info->port.mutex);
763
764 wake_up_interruptible(&info->port.open_wait);
765}
766
767static void set_termios(struct tty_struct *tty, struct ktermios *old_termios)
768{
769 struct slgt_info *info = tty->driver_data;
770 unsigned long flags;
771
772 DBGINFO(("%s set_termios\n", tty->driver->name));
773
774 change_params(info);
775
776 /* Handle transition to B0 status */
777 if ((old_termios->c_cflag & CBAUD) && !C_BAUD(tty)) {
778 info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
779 spin_lock_irqsave(&info->lock,flags);
780 set_signals(info);
781 spin_unlock_irqrestore(&info->lock,flags);
782 }
783
784 /* Handle transition away from B0 status */
785 if (!(old_termios->c_cflag & CBAUD) && C_BAUD(tty)) {
786 info->signals |= SerialSignal_DTR;
787 if (!C_CRTSCTS(tty) || !test_bit(TTY_THROTTLED, &tty->flags))
788 info->signals |= SerialSignal_RTS;
789 spin_lock_irqsave(&info->lock,flags);
790 set_signals(info);
791 spin_unlock_irqrestore(&info->lock,flags);
792 }
793
794 /* Handle turning off CRTSCTS */
795 if ((old_termios->c_cflag & CRTSCTS) && !C_CRTSCTS(tty)) {
796 tty->hw_stopped = 0;
797 tx_release(tty);
798 }
799}
800
801static void update_tx_timer(struct slgt_info *info)
802{
803 /*
804 * use worst case speed of 1200bps to calculate transmit timeout
805 * based on data in buffers (tbuf_bytes) and FIFO (128 bytes)
806 */
807 if (info->params.mode == MGSL_MODE_HDLC) {
808 int timeout = (tbuf_bytes(info) * 7) + 1000;
809 mod_timer(&info->tx_timer, jiffies + msecs_to_jiffies(timeout));
810 }
811}
812
813static int write(struct tty_struct *tty,
814 const unsigned char *buf, int count)
815{
816 int ret = 0;
817 struct slgt_info *info = tty->driver_data;
818 unsigned long flags;
819
820 if (sanity_check(info, tty->name, "write"))
821 return -EIO;
822
823 DBGINFO(("%s write count=%d\n", info->device_name, count));
824
825 if (!info->tx_buf || (count > info->max_frame_size))
826 return -EIO;
827
828 if (!count || tty->stopped || tty->hw_stopped)
829 return 0;
830
831 spin_lock_irqsave(&info->lock, flags);
832
833 if (info->tx_count) {
834 /* send accumulated data from send_char() */
835 if (!tx_load(info, info->tx_buf, info->tx_count))
836 goto cleanup;
837 info->tx_count = 0;
838 }
839
840 if (tx_load(info, buf, count))
841 ret = count;
842
843cleanup:
844 spin_unlock_irqrestore(&info->lock, flags);
845 DBGINFO(("%s write rc=%d\n", info->device_name, ret));
846 return ret;
847}
848
849static int put_char(struct tty_struct *tty, unsigned char ch)
850{
851 struct slgt_info *info = tty->driver_data;
852 unsigned long flags;
853 int ret = 0;
854
855 if (sanity_check(info, tty->name, "put_char"))
856 return 0;
857 DBGINFO(("%s put_char(%d)\n", info->device_name, ch));
858 if (!info->tx_buf)
859 return 0;
860 spin_lock_irqsave(&info->lock,flags);
861 if (info->tx_count < info->max_frame_size) {
862 info->tx_buf[info->tx_count++] = ch;
863 ret = 1;
864 }
865 spin_unlock_irqrestore(&info->lock,flags);
866 return ret;
867}
868
869static void send_xchar(struct tty_struct *tty, char ch)
870{
871 struct slgt_info *info = tty->driver_data;
872 unsigned long flags;
873
874 if (sanity_check(info, tty->name, "send_xchar"))
875 return;
876 DBGINFO(("%s send_xchar(%d)\n", info->device_name, ch));
877 info->x_char = ch;
878 if (ch) {
879 spin_lock_irqsave(&info->lock,flags);
880 if (!info->tx_enabled)
881 tx_start(info);
882 spin_unlock_irqrestore(&info->lock,flags);
883 }
884}
885
886static void wait_until_sent(struct tty_struct *tty, int timeout)
887{
888 struct slgt_info *info = tty->driver_data;
889 unsigned long orig_jiffies, char_time;
890
891 if (!info )
892 return;
893 if (sanity_check(info, tty->name, "wait_until_sent"))
894 return;
895 DBGINFO(("%s wait_until_sent entry\n", info->device_name));
896 if (!(info->port.flags & ASYNC_INITIALIZED))
897 goto exit;
898
899 orig_jiffies = jiffies;
900
901 /* Set check interval to 1/5 of estimated time to
902 * send a character, and make it at least 1. The check
903 * interval should also be less than the timeout.
904 * Note: use tight timings here to satisfy the NIST-PCTS.
905 */
906
907 if (info->params.data_rate) {
908 char_time = info->timeout/(32 * 5);
909 if (!char_time)
910 char_time++;
911 } else
912 char_time = 1;
913
914 if (timeout)
915 char_time = min_t(unsigned long, char_time, timeout);
916
917 while (info->tx_active) {
918 msleep_interruptible(jiffies_to_msecs(char_time));
919 if (signal_pending(current))
920 break;
921 if (timeout && time_after(jiffies, orig_jiffies + timeout))
922 break;
923 }
924exit:
925 DBGINFO(("%s wait_until_sent exit\n", info->device_name));
926}
927
928static int write_room(struct tty_struct *tty)
929{
930 struct slgt_info *info = tty->driver_data;
931 int ret;
932
933 if (sanity_check(info, tty->name, "write_room"))
934 return 0;
935 ret = (info->tx_active) ? 0 : HDLC_MAX_FRAME_SIZE;
936 DBGINFO(("%s write_room=%d\n", info->device_name, ret));
937 return ret;
938}
939
940static void flush_chars(struct tty_struct *tty)
941{
942 struct slgt_info *info = tty->driver_data;
943 unsigned long flags;
944
945 if (sanity_check(info, tty->name, "flush_chars"))
946 return;
947 DBGINFO(("%s flush_chars entry tx_count=%d\n", info->device_name, info->tx_count));
948
949 if (info->tx_count <= 0 || tty->stopped ||
950 tty->hw_stopped || !info->tx_buf)
951 return;
952
953 DBGINFO(("%s flush_chars start transmit\n", info->device_name));
954
955 spin_lock_irqsave(&info->lock,flags);
956 if (info->tx_count && tx_load(info, info->tx_buf, info->tx_count))
957 info->tx_count = 0;
958 spin_unlock_irqrestore(&info->lock,flags);
959}
960
961static void flush_buffer(struct tty_struct *tty)
962{
963 struct slgt_info *info = tty->driver_data;
964 unsigned long flags;
965
966 if (sanity_check(info, tty->name, "flush_buffer"))
967 return;
968 DBGINFO(("%s flush_buffer\n", info->device_name));
969
970 spin_lock_irqsave(&info->lock, flags);
971 info->tx_count = 0;
972 spin_unlock_irqrestore(&info->lock, flags);
973
974 tty_wakeup(tty);
975}
976
977/*
978 * throttle (stop) transmitter
979 */
980static void tx_hold(struct tty_struct *tty)
981{
982 struct slgt_info *info = tty->driver_data;
983 unsigned long flags;
984
985 if (sanity_check(info, tty->name, "tx_hold"))
986 return;
987 DBGINFO(("%s tx_hold\n", info->device_name));
988 spin_lock_irqsave(&info->lock,flags);
989 if (info->tx_enabled && info->params.mode == MGSL_MODE_ASYNC)
990 tx_stop(info);
991 spin_unlock_irqrestore(&info->lock,flags);
992}
993
994/*
995 * release (start) transmitter
996 */
997static void tx_release(struct tty_struct *tty)
998{
999 struct slgt_info *info = tty->driver_data;
1000 unsigned long flags;
1001
1002 if (sanity_check(info, tty->name, "tx_release"))
1003 return;
1004 DBGINFO(("%s tx_release\n", info->device_name));
1005 spin_lock_irqsave(&info->lock, flags);
1006 if (info->tx_count && tx_load(info, info->tx_buf, info->tx_count))
1007 info->tx_count = 0;
1008 spin_unlock_irqrestore(&info->lock, flags);
1009}
1010
1011/*
1012 * Service an IOCTL request
1013 *
1014 * Arguments
1015 *
1016 * tty pointer to tty instance data
1017 * cmd IOCTL command code
1018 * arg command argument/context
1019 *
1020 * Return 0 if success, otherwise error code
1021 */
1022static int ioctl(struct tty_struct *tty,
1023 unsigned int cmd, unsigned long arg)
1024{
1025 struct slgt_info *info = tty->driver_data;
1026 void __user *argp = (void __user *)arg;
1027 int ret;
1028
1029 if (sanity_check(info, tty->name, "ioctl"))
1030 return -ENODEV;
1031 DBGINFO(("%s ioctl() cmd=%08X\n", info->device_name, cmd));
1032
1033 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1034 (cmd != TIOCMIWAIT)) {
1035 if (tty->flags & (1 << TTY_IO_ERROR))
1036 return -EIO;
1037 }
1038
1039 switch (cmd) {
1040 case MGSL_IOCWAITEVENT:
1041 return wait_mgsl_event(info, argp);
1042 case TIOCMIWAIT:
1043 return modem_input_wait(info,(int)arg);
1044 case MGSL_IOCSGPIO:
1045 return set_gpio(info, argp);
1046 case MGSL_IOCGGPIO:
1047 return get_gpio(info, argp);
1048 case MGSL_IOCWAITGPIO:
1049 return wait_gpio(info, argp);
1050 case MGSL_IOCGXSYNC:
1051 return get_xsync(info, argp);
1052 case MGSL_IOCSXSYNC:
1053 return set_xsync(info, (int)arg);
1054 case MGSL_IOCGXCTRL:
1055 return get_xctrl(info, argp);
1056 case MGSL_IOCSXCTRL:
1057 return set_xctrl(info, (int)arg);
1058 }
1059 mutex_lock(&info->port.mutex);
1060 switch (cmd) {
1061 case MGSL_IOCGPARAMS:
1062 ret = get_params(info, argp);
1063 break;
1064 case MGSL_IOCSPARAMS:
1065 ret = set_params(info, argp);
1066 break;
1067 case MGSL_IOCGTXIDLE:
1068 ret = get_txidle(info, argp);
1069 break;
1070 case MGSL_IOCSTXIDLE:
1071 ret = set_txidle(info, (int)arg);
1072 break;
1073 case MGSL_IOCTXENABLE:
1074 ret = tx_enable(info, (int)arg);
1075 break;
1076 case MGSL_IOCRXENABLE:
1077 ret = rx_enable(info, (int)arg);
1078 break;
1079 case MGSL_IOCTXABORT:
1080 ret = tx_abort(info);
1081 break;
1082 case MGSL_IOCGSTATS:
1083 ret = get_stats(info, argp);
1084 break;
1085 case MGSL_IOCGIF:
1086 ret = get_interface(info, argp);
1087 break;
1088 case MGSL_IOCSIF:
1089 ret = set_interface(info,(int)arg);
1090 break;
1091 default:
1092 ret = -ENOIOCTLCMD;
1093 }
1094 mutex_unlock(&info->port.mutex);
1095 return ret;
1096}
1097
1098static int get_icount(struct tty_struct *tty,
1099 struct serial_icounter_struct *icount)
1100
1101{
1102 struct slgt_info *info = tty->driver_data;
1103 struct mgsl_icount cnow; /* kernel counter temps */
1104 unsigned long flags;
1105
1106 spin_lock_irqsave(&info->lock,flags);
1107 cnow = info->icount;
1108 spin_unlock_irqrestore(&info->lock,flags);
1109
1110 icount->cts = cnow.cts;
1111 icount->dsr = cnow.dsr;
1112 icount->rng = cnow.rng;
1113 icount->dcd = cnow.dcd;
1114 icount->rx = cnow.rx;
1115 icount->tx = cnow.tx;
1116 icount->frame = cnow.frame;
1117 icount->overrun = cnow.overrun;
1118 icount->parity = cnow.parity;
1119 icount->brk = cnow.brk;
1120 icount->buf_overrun = cnow.buf_overrun;
1121
1122 return 0;
1123}
1124
1125/*
1126 * support for 32 bit ioctl calls on 64 bit systems
1127 */
1128#ifdef CONFIG_COMPAT
1129static long get_params32(struct slgt_info *info, struct MGSL_PARAMS32 __user *user_params)
1130{
1131 struct MGSL_PARAMS32 tmp_params;
1132
1133 DBGINFO(("%s get_params32\n", info->device_name));
1134 memset(&tmp_params, 0, sizeof(tmp_params));
1135 tmp_params.mode = (compat_ulong_t)info->params.mode;
1136 tmp_params.loopback = info->params.loopback;
1137 tmp_params.flags = info->params.flags;
1138 tmp_params.encoding = info->params.encoding;
1139 tmp_params.clock_speed = (compat_ulong_t)info->params.clock_speed;
1140 tmp_params.addr_filter = info->params.addr_filter;
1141 tmp_params.crc_type = info->params.crc_type;
1142 tmp_params.preamble_length = info->params.preamble_length;
1143 tmp_params.preamble = info->params.preamble;
1144 tmp_params.data_rate = (compat_ulong_t)info->params.data_rate;
1145 tmp_params.data_bits = info->params.data_bits;
1146 tmp_params.stop_bits = info->params.stop_bits;
1147 tmp_params.parity = info->params.parity;
1148 if (copy_to_user(user_params, &tmp_params, sizeof(struct MGSL_PARAMS32)))
1149 return -EFAULT;
1150 return 0;
1151}
1152
1153static long set_params32(struct slgt_info *info, struct MGSL_PARAMS32 __user *new_params)
1154{
1155 struct MGSL_PARAMS32 tmp_params;
1156
1157 DBGINFO(("%s set_params32\n", info->device_name));
1158 if (copy_from_user(&tmp_params, new_params, sizeof(struct MGSL_PARAMS32)))
1159 return -EFAULT;
1160
1161 spin_lock(&info->lock);
1162 if (tmp_params.mode == MGSL_MODE_BASE_CLOCK) {
1163 info->base_clock = tmp_params.clock_speed;
1164 } else {
1165 info->params.mode = tmp_params.mode;
1166 info->params.loopback = tmp_params.loopback;
1167 info->params.flags = tmp_params.flags;
1168 info->params.encoding = tmp_params.encoding;
1169 info->params.clock_speed = tmp_params.clock_speed;
1170 info->params.addr_filter = tmp_params.addr_filter;
1171 info->params.crc_type = tmp_params.crc_type;
1172 info->params.preamble_length = tmp_params.preamble_length;
1173 info->params.preamble = tmp_params.preamble;
1174 info->params.data_rate = tmp_params.data_rate;
1175 info->params.data_bits = tmp_params.data_bits;
1176 info->params.stop_bits = tmp_params.stop_bits;
1177 info->params.parity = tmp_params.parity;
1178 }
1179 spin_unlock(&info->lock);
1180
1181 program_hw(info);
1182
1183 return 0;
1184}
1185
1186static long slgt_compat_ioctl(struct tty_struct *tty,
1187 unsigned int cmd, unsigned long arg)
1188{
1189 struct slgt_info *info = tty->driver_data;
1190 int rc = -ENOIOCTLCMD;
1191
1192 if (sanity_check(info, tty->name, "compat_ioctl"))
1193 return -ENODEV;
1194 DBGINFO(("%s compat_ioctl() cmd=%08X\n", info->device_name, cmd));
1195
1196 switch (cmd) {
1197
1198 case MGSL_IOCSPARAMS32:
1199 rc = set_params32(info, compat_ptr(arg));
1200 break;
1201
1202 case MGSL_IOCGPARAMS32:
1203 rc = get_params32(info, compat_ptr(arg));
1204 break;
1205
1206 case MGSL_IOCGPARAMS:
1207 case MGSL_IOCSPARAMS:
1208 case MGSL_IOCGTXIDLE:
1209 case MGSL_IOCGSTATS:
1210 case MGSL_IOCWAITEVENT:
1211 case MGSL_IOCGIF:
1212 case MGSL_IOCSGPIO:
1213 case MGSL_IOCGGPIO:
1214 case MGSL_IOCWAITGPIO:
1215 case MGSL_IOCGXSYNC:
1216 case MGSL_IOCGXCTRL:
1217 case MGSL_IOCSTXIDLE:
1218 case MGSL_IOCTXENABLE:
1219 case MGSL_IOCRXENABLE:
1220 case MGSL_IOCTXABORT:
1221 case TIOCMIWAIT:
1222 case MGSL_IOCSIF:
1223 case MGSL_IOCSXSYNC:
1224 case MGSL_IOCSXCTRL:
1225 rc = ioctl(tty, cmd, arg);
1226 break;
1227 }
1228
1229 DBGINFO(("%s compat_ioctl() cmd=%08X rc=%d\n", info->device_name, cmd, rc));
1230 return rc;
1231}
1232#else
1233#define slgt_compat_ioctl NULL
1234#endif /* ifdef CONFIG_COMPAT */
1235
1236/*
1237 * proc fs support
1238 */
1239static inline void line_info(struct seq_file *m, struct slgt_info *info)
1240{
1241 char stat_buf[30];
1242 unsigned long flags;
1243
1244 seq_printf(m, "%s: IO=%08X IRQ=%d MaxFrameSize=%u\n",
1245 info->device_name, info->phys_reg_addr,
1246 info->irq_level, info->max_frame_size);
1247
1248 /* output current serial signal states */
1249 spin_lock_irqsave(&info->lock,flags);
1250 get_signals(info);
1251 spin_unlock_irqrestore(&info->lock,flags);
1252
1253 stat_buf[0] = 0;
1254 stat_buf[1] = 0;
1255 if (info->signals & SerialSignal_RTS)
1256 strcat(stat_buf, "|RTS");
1257 if (info->signals & SerialSignal_CTS)
1258 strcat(stat_buf, "|CTS");
1259 if (info->signals & SerialSignal_DTR)
1260 strcat(stat_buf, "|DTR");
1261 if (info->signals & SerialSignal_DSR)
1262 strcat(stat_buf, "|DSR");
1263 if (info->signals & SerialSignal_DCD)
1264 strcat(stat_buf, "|CD");
1265 if (info->signals & SerialSignal_RI)
1266 strcat(stat_buf, "|RI");
1267
1268 if (info->params.mode != MGSL_MODE_ASYNC) {
1269 seq_printf(m, "\tHDLC txok:%d rxok:%d",
1270 info->icount.txok, info->icount.rxok);
1271 if (info->icount.txunder)
1272 seq_printf(m, " txunder:%d", info->icount.txunder);
1273 if (info->icount.txabort)
1274 seq_printf(m, " txabort:%d", info->icount.txabort);
1275 if (info->icount.rxshort)
1276 seq_printf(m, " rxshort:%d", info->icount.rxshort);
1277 if (info->icount.rxlong)
1278 seq_printf(m, " rxlong:%d", info->icount.rxlong);
1279 if (info->icount.rxover)
1280 seq_printf(m, " rxover:%d", info->icount.rxover);
1281 if (info->icount.rxcrc)
1282 seq_printf(m, " rxcrc:%d", info->icount.rxcrc);
1283 } else {
1284 seq_printf(m, "\tASYNC tx:%d rx:%d",
1285 info->icount.tx, info->icount.rx);
1286 if (info->icount.frame)
1287 seq_printf(m, " fe:%d", info->icount.frame);
1288 if (info->icount.parity)
1289 seq_printf(m, " pe:%d", info->icount.parity);
1290 if (info->icount.brk)
1291 seq_printf(m, " brk:%d", info->icount.brk);
1292 if (info->icount.overrun)
1293 seq_printf(m, " oe:%d", info->icount.overrun);
1294 }
1295
1296 /* Append serial signal status to end */
1297 seq_printf(m, " %s\n", stat_buf+1);
1298
1299 seq_printf(m, "\ttxactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
1300 info->tx_active,info->bh_requested,info->bh_running,
1301 info->pending_bh);
1302}
1303
1304/* Called to print information about devices
1305 */
1306static int synclink_gt_proc_show(struct seq_file *m, void *v)
1307{
1308 struct slgt_info *info;
1309
1310 seq_puts(m, "synclink_gt driver\n");
1311
1312 info = slgt_device_list;
1313 while( info ) {
1314 line_info(m, info);
1315 info = info->next_device;
1316 }
1317 return 0;
1318}
1319
1320static int synclink_gt_proc_open(struct inode *inode, struct file *file)
1321{
1322 return single_open(file, synclink_gt_proc_show, NULL);
1323}
1324
1325static const struct file_operations synclink_gt_proc_fops = {
1326 .owner = THIS_MODULE,
1327 .open = synclink_gt_proc_open,
1328 .read = seq_read,
1329 .llseek = seq_lseek,
1330 .release = single_release,
1331};
1332
1333/*
1334 * return count of bytes in transmit buffer
1335 */
1336static int chars_in_buffer(struct tty_struct *tty)
1337{
1338 struct slgt_info *info = tty->driver_data;
1339 int count;
1340 if (sanity_check(info, tty->name, "chars_in_buffer"))
1341 return 0;
1342 count = tbuf_bytes(info);
1343 DBGINFO(("%s chars_in_buffer()=%d\n", info->device_name, count));
1344 return count;
1345}
1346
1347/*
1348 * signal remote device to throttle send data (our receive data)
1349 */
1350static void throttle(struct tty_struct * tty)
1351{
1352 struct slgt_info *info = tty->driver_data;
1353 unsigned long flags;
1354
1355 if (sanity_check(info, tty->name, "throttle"))
1356 return;
1357 DBGINFO(("%s throttle\n", info->device_name));
1358 if (I_IXOFF(tty))
1359 send_xchar(tty, STOP_CHAR(tty));
1360 if (C_CRTSCTS(tty)) {
1361 spin_lock_irqsave(&info->lock,flags);
1362 info->signals &= ~SerialSignal_RTS;
1363 set_signals(info);
1364 spin_unlock_irqrestore(&info->lock,flags);
1365 }
1366}
1367
1368/*
1369 * signal remote device to stop throttling send data (our receive data)
1370 */
1371static void unthrottle(struct tty_struct * tty)
1372{
1373 struct slgt_info *info = tty->driver_data;
1374 unsigned long flags;
1375
1376 if (sanity_check(info, tty->name, "unthrottle"))
1377 return;
1378 DBGINFO(("%s unthrottle\n", info->device_name));
1379 if (I_IXOFF(tty)) {
1380 if (info->x_char)
1381 info->x_char = 0;
1382 else
1383 send_xchar(tty, START_CHAR(tty));
1384 }
1385 if (C_CRTSCTS(tty)) {
1386 spin_lock_irqsave(&info->lock,flags);
1387 info->signals |= SerialSignal_RTS;
1388 set_signals(info);
1389 spin_unlock_irqrestore(&info->lock,flags);
1390 }
1391}
1392
1393/*
1394 * set or clear transmit break condition
1395 * break_state -1=set break condition, 0=clear
1396 */
1397static int set_break(struct tty_struct *tty, int break_state)
1398{
1399 struct slgt_info *info = tty->driver_data;
1400 unsigned short value;
1401 unsigned long flags;
1402
1403 if (sanity_check(info, tty->name, "set_break"))
1404 return -EINVAL;
1405 DBGINFO(("%s set_break(%d)\n", info->device_name, break_state));
1406
1407 spin_lock_irqsave(&info->lock,flags);
1408 value = rd_reg16(info, TCR);
1409 if (break_state == -1)
1410 value |= BIT6;
1411 else
1412 value &= ~BIT6;
1413 wr_reg16(info, TCR, value);
1414 spin_unlock_irqrestore(&info->lock,flags);
1415 return 0;
1416}
1417
1418#if SYNCLINK_GENERIC_HDLC
1419
1420/**
1421 * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
1422 * set encoding and frame check sequence (FCS) options
1423 *
1424 * dev pointer to network device structure
1425 * encoding serial encoding setting
1426 * parity FCS setting
1427 *
1428 * returns 0 if success, otherwise error code
1429 */
1430static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
1431 unsigned short parity)
1432{
1433 struct slgt_info *info = dev_to_port(dev);
1434 unsigned char new_encoding;
1435 unsigned short new_crctype;
1436
1437 /* return error if TTY interface open */
1438 if (info->port.count)
1439 return -EBUSY;
1440
1441 DBGINFO(("%s hdlcdev_attach\n", info->device_name));
1442
1443 switch (encoding)
1444 {
1445 case ENCODING_NRZ: new_encoding = HDLC_ENCODING_NRZ; break;
1446 case ENCODING_NRZI: new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
1447 case ENCODING_FM_MARK: new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
1448 case ENCODING_FM_SPACE: new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
1449 case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
1450 default: return -EINVAL;
1451 }
1452
1453 switch (parity)
1454 {
1455 case PARITY_NONE: new_crctype = HDLC_CRC_NONE; break;
1456 case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
1457 case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
1458 default: return -EINVAL;
1459 }
1460
1461 info->params.encoding = new_encoding;
1462 info->params.crc_type = new_crctype;
1463
1464 /* if network interface up, reprogram hardware */
1465 if (info->netcount)
1466 program_hw(info);
1467
1468 return 0;
1469}
1470
1471/**
1472 * called by generic HDLC layer to send frame
1473 *
1474 * skb socket buffer containing HDLC frame
1475 * dev pointer to network device structure
1476 */
1477static netdev_tx_t hdlcdev_xmit(struct sk_buff *skb,
1478 struct net_device *dev)
1479{
1480 struct slgt_info *info = dev_to_port(dev);
1481 unsigned long flags;
1482
1483 DBGINFO(("%s hdlc_xmit\n", dev->name));
1484
1485 if (!skb->len)
1486 return NETDEV_TX_OK;
1487
1488 /* stop sending until this frame completes */
1489 netif_stop_queue(dev);
1490
1491 /* update network statistics */
1492 dev->stats.tx_packets++;
1493 dev->stats.tx_bytes += skb->len;
1494
1495 /* save start time for transmit timeout detection */
1496 dev->trans_start = jiffies;
1497
1498 spin_lock_irqsave(&info->lock, flags);
1499 tx_load(info, skb->data, skb->len);
1500 spin_unlock_irqrestore(&info->lock, flags);
1501
1502 /* done with socket buffer, so free it */
1503 dev_kfree_skb(skb);
1504
1505 return NETDEV_TX_OK;
1506}
1507
1508/**
1509 * called by network layer when interface enabled
1510 * claim resources and initialize hardware
1511 *
1512 * dev pointer to network device structure
1513 *
1514 * returns 0 if success, otherwise error code
1515 */
1516static int hdlcdev_open(struct net_device *dev)
1517{
1518 struct slgt_info *info = dev_to_port(dev);
1519 int rc;
1520 unsigned long flags;
1521
1522 if (!try_module_get(THIS_MODULE))
1523 return -EBUSY;
1524
1525 DBGINFO(("%s hdlcdev_open\n", dev->name));
1526
1527 /* generic HDLC layer open processing */
1528 rc = hdlc_open(dev);
1529 if (rc)
1530 return rc;
1531
1532 /* arbitrate between network and tty opens */
1533 spin_lock_irqsave(&info->netlock, flags);
1534 if (info->port.count != 0 || info->netcount != 0) {
1535 DBGINFO(("%s hdlc_open busy\n", dev->name));
1536 spin_unlock_irqrestore(&info->netlock, flags);
1537 return -EBUSY;
1538 }
1539 info->netcount=1;
1540 spin_unlock_irqrestore(&info->netlock, flags);
1541
1542 /* claim resources and init adapter */
1543 if ((rc = startup(info)) != 0) {
1544 spin_lock_irqsave(&info->netlock, flags);
1545 info->netcount=0;
1546 spin_unlock_irqrestore(&info->netlock, flags);
1547 return rc;
1548 }
1549
1550 /* assert RTS and DTR, apply hardware settings */
1551 info->signals |= SerialSignal_RTS | SerialSignal_DTR;
1552 program_hw(info);
1553
1554 /* enable network layer transmit */
1555 dev->trans_start = jiffies;
1556 netif_start_queue(dev);
1557
1558 /* inform generic HDLC layer of current DCD status */
1559 spin_lock_irqsave(&info->lock, flags);
1560 get_signals(info);
1561 spin_unlock_irqrestore(&info->lock, flags);
1562 if (info->signals & SerialSignal_DCD)
1563 netif_carrier_on(dev);
1564 else
1565 netif_carrier_off(dev);
1566 return 0;
1567}
1568
1569/**
1570 * called by network layer when interface is disabled
1571 * shutdown hardware and release resources
1572 *
1573 * dev pointer to network device structure
1574 *
1575 * returns 0 if success, otherwise error code
1576 */
1577static int hdlcdev_close(struct net_device *dev)
1578{
1579 struct slgt_info *info = dev_to_port(dev);
1580 unsigned long flags;
1581
1582 DBGINFO(("%s hdlcdev_close\n", dev->name));
1583
1584 netif_stop_queue(dev);
1585
1586 /* shutdown adapter and release resources */
1587 shutdown(info);
1588
1589 hdlc_close(dev);
1590
1591 spin_lock_irqsave(&info->netlock, flags);
1592 info->netcount=0;
1593 spin_unlock_irqrestore(&info->netlock, flags);
1594
1595 module_put(THIS_MODULE);
1596 return 0;
1597}
1598
1599/**
1600 * called by network layer to process IOCTL call to network device
1601 *
1602 * dev pointer to network device structure
1603 * ifr pointer to network interface request structure
1604 * cmd IOCTL command code
1605 *
1606 * returns 0 if success, otherwise error code
1607 */
1608static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1609{
1610 const size_t size = sizeof(sync_serial_settings);
1611 sync_serial_settings new_line;
1612 sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
1613 struct slgt_info *info = dev_to_port(dev);
1614 unsigned int flags;
1615
1616 DBGINFO(("%s hdlcdev_ioctl\n", dev->name));
1617
1618 /* return error if TTY interface open */
1619 if (info->port.count)
1620 return -EBUSY;
1621
1622 if (cmd != SIOCWANDEV)
1623 return hdlc_ioctl(dev, ifr, cmd);
1624
1625 memset(&new_line, 0, sizeof(new_line));
1626
1627 switch(ifr->ifr_settings.type) {
1628 case IF_GET_IFACE: /* return current sync_serial_settings */
1629
1630 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
1631 if (ifr->ifr_settings.size < size) {
1632 ifr->ifr_settings.size = size; /* data size wanted */
1633 return -ENOBUFS;
1634 }
1635
1636 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1637 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
1638 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1639 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
1640
1641 switch (flags){
1642 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
1643 case (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_INT; break;
1644 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_TXINT; break;
1645 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
1646 default: new_line.clock_type = CLOCK_DEFAULT;
1647 }
1648
1649 new_line.clock_rate = info->params.clock_speed;
1650 new_line.loopback = info->params.loopback ? 1:0;
1651
1652 if (copy_to_user(line, &new_line, size))
1653 return -EFAULT;
1654 return 0;
1655
1656 case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
1657
1658 if(!capable(CAP_NET_ADMIN))
1659 return -EPERM;
1660 if (copy_from_user(&new_line, line, size))
1661 return -EFAULT;
1662
1663 switch (new_line.clock_type)
1664 {
1665 case CLOCK_EXT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
1666 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
1667 case CLOCK_INT: flags = HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG; break;
1668 case CLOCK_TXINT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG; break;
1669 case CLOCK_DEFAULT: flags = info->params.flags &
1670 (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1671 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
1672 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1673 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN); break;
1674 default: return -EINVAL;
1675 }
1676
1677 if (new_line.loopback != 0 && new_line.loopback != 1)
1678 return -EINVAL;
1679
1680 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1681 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
1682 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1683 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
1684 info->params.flags |= flags;
1685
1686 info->params.loopback = new_line.loopback;
1687
1688 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
1689 info->params.clock_speed = new_line.clock_rate;
1690 else
1691 info->params.clock_speed = 0;
1692
1693 /* if network interface up, reprogram hardware */
1694 if (info->netcount)
1695 program_hw(info);
1696 return 0;
1697
1698 default:
1699 return hdlc_ioctl(dev, ifr, cmd);
1700 }
1701}
1702
1703/**
1704 * called by network layer when transmit timeout is detected
1705 *
1706 * dev pointer to network device structure
1707 */
1708static void hdlcdev_tx_timeout(struct net_device *dev)
1709{
1710 struct slgt_info *info = dev_to_port(dev);
1711 unsigned long flags;
1712
1713 DBGINFO(("%s hdlcdev_tx_timeout\n", dev->name));
1714
1715 dev->stats.tx_errors++;
1716 dev->stats.tx_aborted_errors++;
1717
1718 spin_lock_irqsave(&info->lock,flags);
1719 tx_stop(info);
1720 spin_unlock_irqrestore(&info->lock,flags);
1721
1722 netif_wake_queue(dev);
1723}
1724
1725/**
1726 * called by device driver when transmit completes
1727 * reenable network layer transmit if stopped
1728 *
1729 * info pointer to device instance information
1730 */
1731static void hdlcdev_tx_done(struct slgt_info *info)
1732{
1733 if (netif_queue_stopped(info->netdev))
1734 netif_wake_queue(info->netdev);
1735}
1736
1737/**
1738 * called by device driver when frame received
1739 * pass frame to network layer
1740 *
1741 * info pointer to device instance information
1742 * buf pointer to buffer contianing frame data
1743 * size count of data bytes in buf
1744 */
1745static void hdlcdev_rx(struct slgt_info *info, char *buf, int size)
1746{
1747 struct sk_buff *skb = dev_alloc_skb(size);
1748 struct net_device *dev = info->netdev;
1749
1750 DBGINFO(("%s hdlcdev_rx\n", dev->name));
1751
1752 if (skb == NULL) {
1753 DBGERR(("%s: can't alloc skb, drop packet\n", dev->name));
1754 dev->stats.rx_dropped++;
1755 return;
1756 }
1757
1758 memcpy(skb_put(skb, size), buf, size);
1759
1760 skb->protocol = hdlc_type_trans(skb, dev);
1761
1762 dev->stats.rx_packets++;
1763 dev->stats.rx_bytes += size;
1764
1765 netif_rx(skb);
1766}
1767
1768static const struct net_device_ops hdlcdev_ops = {
1769 .ndo_open = hdlcdev_open,
1770 .ndo_stop = hdlcdev_close,
1771 .ndo_change_mtu = hdlc_change_mtu,
1772 .ndo_start_xmit = hdlc_start_xmit,
1773 .ndo_do_ioctl = hdlcdev_ioctl,
1774 .ndo_tx_timeout = hdlcdev_tx_timeout,
1775};
1776
1777/**
1778 * called by device driver when adding device instance
1779 * do generic HDLC initialization
1780 *
1781 * info pointer to device instance information
1782 *
1783 * returns 0 if success, otherwise error code
1784 */
1785static int hdlcdev_init(struct slgt_info *info)
1786{
1787 int rc;
1788 struct net_device *dev;
1789 hdlc_device *hdlc;
1790
1791 /* allocate and initialize network and HDLC layer objects */
1792
1793 dev = alloc_hdlcdev(info);
1794 if (!dev) {
1795 printk(KERN_ERR "%s hdlc device alloc failure\n", info->device_name);
1796 return -ENOMEM;
1797 }
1798
1799 /* for network layer reporting purposes only */
1800 dev->mem_start = info->phys_reg_addr;
1801 dev->mem_end = info->phys_reg_addr + SLGT_REG_SIZE - 1;
1802 dev->irq = info->irq_level;
1803
1804 /* network layer callbacks and settings */
1805 dev->netdev_ops = &hdlcdev_ops;
1806 dev->watchdog_timeo = 10 * HZ;
1807 dev->tx_queue_len = 50;
1808
1809 /* generic HDLC layer callbacks and settings */
1810 hdlc = dev_to_hdlc(dev);
1811 hdlc->attach = hdlcdev_attach;
1812 hdlc->xmit = hdlcdev_xmit;
1813
1814 /* register objects with HDLC layer */
1815 rc = register_hdlc_device(dev);
1816 if (rc) {
1817 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
1818 free_netdev(dev);
1819 return rc;
1820 }
1821
1822 info->netdev = dev;
1823 return 0;
1824}
1825
1826/**
1827 * called by device driver when removing device instance
1828 * do generic HDLC cleanup
1829 *
1830 * info pointer to device instance information
1831 */
1832static void hdlcdev_exit(struct slgt_info *info)
1833{
1834 unregister_hdlc_device(info->netdev);
1835 free_netdev(info->netdev);
1836 info->netdev = NULL;
1837}
1838
1839#endif /* ifdef CONFIG_HDLC */
1840
1841/*
1842 * get async data from rx DMA buffers
1843 */
1844static void rx_async(struct slgt_info *info)
1845{
1846 struct mgsl_icount *icount = &info->icount;
1847 unsigned int start, end;
1848 unsigned char *p;
1849 unsigned char status;
1850 struct slgt_desc *bufs = info->rbufs;
1851 int i, count;
1852 int chars = 0;
1853 int stat;
1854 unsigned char ch;
1855
1856 start = end = info->rbuf_current;
1857
1858 while(desc_complete(bufs[end])) {
1859 count = desc_count(bufs[end]) - info->rbuf_index;
1860 p = bufs[end].buf + info->rbuf_index;
1861
1862 DBGISR(("%s rx_async count=%d\n", info->device_name, count));
1863 DBGDATA(info, p, count, "rx");
1864
1865 for(i=0 ; i < count; i+=2, p+=2) {
1866 ch = *p;
1867 icount->rx++;
1868
1869 stat = 0;
1870
1871 status = *(p + 1) & (BIT1 + BIT0);
1872 if (status) {
1873 if (status & BIT1)
1874 icount->parity++;
1875 else if (status & BIT0)
1876 icount->frame++;
1877 /* discard char if tty control flags say so */
1878 if (status & info->ignore_status_mask)
1879 continue;
1880 if (status & BIT1)
1881 stat = TTY_PARITY;
1882 else if (status & BIT0)
1883 stat = TTY_FRAME;
1884 }
1885 tty_insert_flip_char(&info->port, ch, stat);
1886 chars++;
1887 }
1888
1889 if (i < count) {
1890 /* receive buffer not completed */
1891 info->rbuf_index += i;
1892 mod_timer(&info->rx_timer, jiffies + 1);
1893 break;
1894 }
1895
1896 info->rbuf_index = 0;
1897 free_rbufs(info, end, end);
1898
1899 if (++end == info->rbuf_count)
1900 end = 0;
1901
1902 /* if entire list searched then no frame available */
1903 if (end == start)
1904 break;
1905 }
1906
1907 if (chars)
1908 tty_flip_buffer_push(&info->port);
1909}
1910
1911/*
1912 * return next bottom half action to perform
1913 */
1914static int bh_action(struct slgt_info *info)
1915{
1916 unsigned long flags;
1917 int rc;
1918
1919 spin_lock_irqsave(&info->lock,flags);
1920
1921 if (info->pending_bh & BH_RECEIVE) {
1922 info->pending_bh &= ~BH_RECEIVE;
1923 rc = BH_RECEIVE;
1924 } else if (info->pending_bh & BH_TRANSMIT) {
1925 info->pending_bh &= ~BH_TRANSMIT;
1926 rc = BH_TRANSMIT;
1927 } else if (info->pending_bh & BH_STATUS) {
1928 info->pending_bh &= ~BH_STATUS;
1929 rc = BH_STATUS;
1930 } else {
1931 /* Mark BH routine as complete */
1932 info->bh_running = false;
1933 info->bh_requested = false;
1934 rc = 0;
1935 }
1936
1937 spin_unlock_irqrestore(&info->lock,flags);
1938
1939 return rc;
1940}
1941
1942/*
1943 * perform bottom half processing
1944 */
1945static void bh_handler(struct work_struct *work)
1946{
1947 struct slgt_info *info = container_of(work, struct slgt_info, task);
1948 int action;
1949
1950 info->bh_running = true;
1951
1952 while((action = bh_action(info))) {
1953 switch (action) {
1954 case BH_RECEIVE:
1955 DBGBH(("%s bh receive\n", info->device_name));
1956 switch(info->params.mode) {
1957 case MGSL_MODE_ASYNC:
1958 rx_async(info);
1959 break;
1960 case MGSL_MODE_HDLC:
1961 while(rx_get_frame(info));
1962 break;
1963 case MGSL_MODE_RAW:
1964 case MGSL_MODE_MONOSYNC:
1965 case MGSL_MODE_BISYNC:
1966 case MGSL_MODE_XSYNC:
1967 while(rx_get_buf(info));
1968 break;
1969 }
1970 /* restart receiver if rx DMA buffers exhausted */
1971 if (info->rx_restart)
1972 rx_start(info);
1973 break;
1974 case BH_TRANSMIT:
1975 bh_transmit(info);
1976 break;
1977 case BH_STATUS:
1978 DBGBH(("%s bh status\n", info->device_name));
1979 info->ri_chkcount = 0;
1980 info->dsr_chkcount = 0;
1981 info->dcd_chkcount = 0;
1982 info->cts_chkcount = 0;
1983 break;
1984 default:
1985 DBGBH(("%s unknown action\n", info->device_name));
1986 break;
1987 }
1988 }
1989 DBGBH(("%s bh_handler exit\n", info->device_name));
1990}
1991
1992static void bh_transmit(struct slgt_info *info)
1993{
1994 struct tty_struct *tty = info->port.tty;
1995
1996 DBGBH(("%s bh_transmit\n", info->device_name));
1997 if (tty)
1998 tty_wakeup(tty);
1999}
2000
2001static void dsr_change(struct slgt_info *info, unsigned short status)
2002{
2003 if (status & BIT3) {
2004 info->signals |= SerialSignal_DSR;
2005 info->input_signal_events.dsr_up++;
2006 } else {
2007 info->signals &= ~SerialSignal_DSR;
2008 info->input_signal_events.dsr_down++;
2009 }
2010 DBGISR(("dsr_change %s signals=%04X\n", info->device_name, info->signals));
2011 if ((info->dsr_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2012 slgt_irq_off(info, IRQ_DSR);
2013 return;
2014 }
2015 info->icount.dsr++;
2016 wake_up_interruptible(&info->status_event_wait_q);
2017 wake_up_interruptible(&info->event_wait_q);
2018 info->pending_bh |= BH_STATUS;
2019}
2020
2021static void cts_change(struct slgt_info *info, unsigned short status)
2022{
2023 if (status & BIT2) {
2024 info->signals |= SerialSignal_CTS;
2025 info->input_signal_events.cts_up++;
2026 } else {
2027 info->signals &= ~SerialSignal_CTS;
2028 info->input_signal_events.cts_down++;
2029 }
2030 DBGISR(("cts_change %s signals=%04X\n", info->device_name, info->signals));
2031 if ((info->cts_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2032 slgt_irq_off(info, IRQ_CTS);
2033 return;
2034 }
2035 info->icount.cts++;
2036 wake_up_interruptible(&info->status_event_wait_q);
2037 wake_up_interruptible(&info->event_wait_q);
2038 info->pending_bh |= BH_STATUS;
2039
2040 if (tty_port_cts_enabled(&info->port)) {
2041 if (info->port.tty) {
2042 if (info->port.tty->hw_stopped) {
2043 if (info->signals & SerialSignal_CTS) {
2044 info->port.tty->hw_stopped = 0;
2045 info->pending_bh |= BH_TRANSMIT;
2046 return;
2047 }
2048 } else {
2049 if (!(info->signals & SerialSignal_CTS))
2050 info->port.tty->hw_stopped = 1;
2051 }
2052 }
2053 }
2054}
2055
2056static void dcd_change(struct slgt_info *info, unsigned short status)
2057{
2058 if (status & BIT1) {
2059 info->signals |= SerialSignal_DCD;
2060 info->input_signal_events.dcd_up++;
2061 } else {
2062 info->signals &= ~SerialSignal_DCD;
2063 info->input_signal_events.dcd_down++;
2064 }
2065 DBGISR(("dcd_change %s signals=%04X\n", info->device_name, info->signals));
2066 if ((info->dcd_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2067 slgt_irq_off(info, IRQ_DCD);
2068 return;
2069 }
2070 info->icount.dcd++;
2071#if SYNCLINK_GENERIC_HDLC
2072 if (info->netcount) {
2073 if (info->signals & SerialSignal_DCD)
2074 netif_carrier_on(info->netdev);
2075 else
2076 netif_carrier_off(info->netdev);
2077 }
2078#endif
2079 wake_up_interruptible(&info->status_event_wait_q);
2080 wake_up_interruptible(&info->event_wait_q);
2081 info->pending_bh |= BH_STATUS;
2082
2083 if (info->port.flags & ASYNC_CHECK_CD) {
2084 if (info->signals & SerialSignal_DCD)
2085 wake_up_interruptible(&info->port.open_wait);
2086 else {
2087 if (info->port.tty)
2088 tty_hangup(info->port.tty);
2089 }
2090 }
2091}
2092
2093static void ri_change(struct slgt_info *info, unsigned short status)
2094{
2095 if (status & BIT0) {
2096 info->signals |= SerialSignal_RI;
2097 info->input_signal_events.ri_up++;
2098 } else {
2099 info->signals &= ~SerialSignal_RI;
2100 info->input_signal_events.ri_down++;
2101 }
2102 DBGISR(("ri_change %s signals=%04X\n", info->device_name, info->signals));
2103 if ((info->ri_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2104 slgt_irq_off(info, IRQ_RI);
2105 return;
2106 }
2107 info->icount.rng++;
2108 wake_up_interruptible(&info->status_event_wait_q);
2109 wake_up_interruptible(&info->event_wait_q);
2110 info->pending_bh |= BH_STATUS;
2111}
2112
2113static void isr_rxdata(struct slgt_info *info)
2114{
2115 unsigned int count = info->rbuf_fill_count;
2116 unsigned int i = info->rbuf_fill_index;
2117 unsigned short reg;
2118
2119 while (rd_reg16(info, SSR) & IRQ_RXDATA) {
2120 reg = rd_reg16(info, RDR);
2121 DBGISR(("isr_rxdata %s RDR=%04X\n", info->device_name, reg));
2122 if (desc_complete(info->rbufs[i])) {
2123 /* all buffers full */
2124 rx_stop(info);
2125 info->rx_restart = 1;
2126 continue;
2127 }
2128 info->rbufs[i].buf[count++] = (unsigned char)reg;
2129 /* async mode saves status byte to buffer for each data byte */
2130 if (info->params.mode == MGSL_MODE_ASYNC)
2131 info->rbufs[i].buf[count++] = (unsigned char)(reg >> 8);
2132 if (count == info->rbuf_fill_level || (reg & BIT10)) {
2133 /* buffer full or end of frame */
2134 set_desc_count(info->rbufs[i], count);
2135 set_desc_status(info->rbufs[i], BIT15 | (reg >> 8));
2136 info->rbuf_fill_count = count = 0;
2137 if (++i == info->rbuf_count)
2138 i = 0;
2139 info->pending_bh |= BH_RECEIVE;
2140 }
2141 }
2142
2143 info->rbuf_fill_index = i;
2144 info->rbuf_fill_count = count;
2145}
2146
2147static void isr_serial(struct slgt_info *info)
2148{
2149 unsigned short status = rd_reg16(info, SSR);
2150
2151 DBGISR(("%s isr_serial status=%04X\n", info->device_name, status));
2152
2153 wr_reg16(info, SSR, status); /* clear pending */
2154
2155 info->irq_occurred = true;
2156
2157 if (info->params.mode == MGSL_MODE_ASYNC) {
2158 if (status & IRQ_TXIDLE) {
2159 if (info->tx_active)
2160 isr_txeom(info, status);
2161 }
2162 if (info->rx_pio && (status & IRQ_RXDATA))
2163 isr_rxdata(info);
2164 if ((status & IRQ_RXBREAK) && (status & RXBREAK)) {
2165 info->icount.brk++;
2166 /* process break detection if tty control allows */
2167 if (info->port.tty) {
2168 if (!(status & info->ignore_status_mask)) {
2169 if (info->read_status_mask & MASK_BREAK) {
2170 tty_insert_flip_char(&info->port, 0, TTY_BREAK);
2171 if (info->port.flags & ASYNC_SAK)
2172 do_SAK(info->port.tty);
2173 }
2174 }
2175 }
2176 }
2177 } else {
2178 if (status & (IRQ_TXIDLE + IRQ_TXUNDER))
2179 isr_txeom(info, status);
2180 if (info->rx_pio && (status & IRQ_RXDATA))
2181 isr_rxdata(info);
2182 if (status & IRQ_RXIDLE) {
2183 if (status & RXIDLE)
2184 info->icount.rxidle++;
2185 else
2186 info->icount.exithunt++;
2187 wake_up_interruptible(&info->event_wait_q);
2188 }
2189
2190 if (status & IRQ_RXOVER)
2191 rx_start(info);
2192 }
2193
2194 if (status & IRQ_DSR)
2195 dsr_change(info, status);
2196 if (status & IRQ_CTS)
2197 cts_change(info, status);
2198 if (status & IRQ_DCD)
2199 dcd_change(info, status);
2200 if (status & IRQ_RI)
2201 ri_change(info, status);
2202}
2203
2204static void isr_rdma(struct slgt_info *info)
2205{
2206 unsigned int status = rd_reg32(info, RDCSR);
2207
2208 DBGISR(("%s isr_rdma status=%08x\n", info->device_name, status));
2209
2210 /* RDCSR (rx DMA control/status)
2211 *
2212 * 31..07 reserved
2213 * 06 save status byte to DMA buffer
2214 * 05 error
2215 * 04 eol (end of list)
2216 * 03 eob (end of buffer)
2217 * 02 IRQ enable
2218 * 01 reset
2219 * 00 enable
2220 */
2221 wr_reg32(info, RDCSR, status); /* clear pending */
2222
2223 if (status & (BIT5 + BIT4)) {
2224 DBGISR(("%s isr_rdma rx_restart=1\n", info->device_name));
2225 info->rx_restart = true;
2226 }
2227 info->pending_bh |= BH_RECEIVE;
2228}
2229
2230static void isr_tdma(struct slgt_info *info)
2231{
2232 unsigned int status = rd_reg32(info, TDCSR);
2233
2234 DBGISR(("%s isr_tdma status=%08x\n", info->device_name, status));
2235
2236 /* TDCSR (tx DMA control/status)
2237 *
2238 * 31..06 reserved
2239 * 05 error
2240 * 04 eol (end of list)
2241 * 03 eob (end of buffer)
2242 * 02 IRQ enable
2243 * 01 reset
2244 * 00 enable
2245 */
2246 wr_reg32(info, TDCSR, status); /* clear pending */
2247
2248 if (status & (BIT5 + BIT4 + BIT3)) {
2249 // another transmit buffer has completed
2250 // run bottom half to get more send data from user
2251 info->pending_bh |= BH_TRANSMIT;
2252 }
2253}
2254
2255/*
2256 * return true if there are unsent tx DMA buffers, otherwise false
2257 *
2258 * if there are unsent buffers then info->tbuf_start
2259 * is set to index of first unsent buffer
2260 */
2261static bool unsent_tbufs(struct slgt_info *info)
2262{
2263 unsigned int i = info->tbuf_current;
2264 bool rc = false;
2265
2266 /*
2267 * search backwards from last loaded buffer (precedes tbuf_current)
2268 * for first unsent buffer (desc_count > 0)
2269 */
2270
2271 do {
2272 if (i)
2273 i--;
2274 else
2275 i = info->tbuf_count - 1;
2276 if (!desc_count(info->tbufs[i]))
2277 break;
2278 info->tbuf_start = i;
2279 rc = true;
2280 } while (i != info->tbuf_current);
2281
2282 return rc;
2283}
2284
2285static void isr_txeom(struct slgt_info *info, unsigned short status)
2286{
2287 DBGISR(("%s txeom status=%04x\n", info->device_name, status));
2288
2289 slgt_irq_off(info, IRQ_TXDATA + IRQ_TXIDLE + IRQ_TXUNDER);
2290 tdma_reset(info);
2291 if (status & IRQ_TXUNDER) {
2292 unsigned short val = rd_reg16(info, TCR);
2293 wr_reg16(info, TCR, (unsigned short)(val | BIT2)); /* set reset bit */
2294 wr_reg16(info, TCR, val); /* clear reset bit */
2295 }
2296
2297 if (info->tx_active) {
2298 if (info->params.mode != MGSL_MODE_ASYNC) {
2299 if (status & IRQ_TXUNDER)
2300 info->icount.txunder++;
2301 else if (status & IRQ_TXIDLE)
2302 info->icount.txok++;
2303 }
2304
2305 if (unsent_tbufs(info)) {
2306 tx_start(info);
2307 update_tx_timer(info);
2308 return;
2309 }
2310 info->tx_active = false;
2311
2312 del_timer(&info->tx_timer);
2313
2314 if (info->params.mode != MGSL_MODE_ASYNC && info->drop_rts_on_tx_done) {
2315 info->signals &= ~SerialSignal_RTS;
2316 info->drop_rts_on_tx_done = false;
2317 set_signals(info);
2318 }
2319
2320#if SYNCLINK_GENERIC_HDLC
2321 if (info->netcount)
2322 hdlcdev_tx_done(info);
2323 else
2324#endif
2325 {
2326 if (info->port.tty && (info->port.tty->stopped || info->port.tty->hw_stopped)) {
2327 tx_stop(info);
2328 return;
2329 }
2330 info->pending_bh |= BH_TRANSMIT;
2331 }
2332 }
2333}
2334
2335static void isr_gpio(struct slgt_info *info, unsigned int changed, unsigned int state)
2336{
2337 struct cond_wait *w, *prev;
2338
2339 /* wake processes waiting for specific transitions */
2340 for (w = info->gpio_wait_q, prev = NULL ; w != NULL ; w = w->next) {
2341 if (w->data & changed) {
2342 w->data = state;
2343 wake_up_interruptible(&w->q);
2344 if (prev != NULL)
2345 prev->next = w->next;
2346 else
2347 info->gpio_wait_q = w->next;
2348 } else
2349 prev = w;
2350 }
2351}
2352
2353/* interrupt service routine
2354 *
2355 * irq interrupt number
2356 * dev_id device ID supplied during interrupt registration
2357 */
2358static irqreturn_t slgt_interrupt(int dummy, void *dev_id)
2359{
2360 struct slgt_info *info = dev_id;
2361 unsigned int gsr;
2362 unsigned int i;
2363
2364 DBGISR(("slgt_interrupt irq=%d entry\n", info->irq_level));
2365
2366 while((gsr = rd_reg32(info, GSR) & 0xffffff00)) {
2367 DBGISR(("%s gsr=%08x\n", info->device_name, gsr));
2368 info->irq_occurred = true;
2369 for(i=0; i < info->port_count ; i++) {
2370 if (info->port_array[i] == NULL)
2371 continue;
2372 spin_lock(&info->port_array[i]->lock);
2373 if (gsr & (BIT8 << i))
2374 isr_serial(info->port_array[i]);
2375 if (gsr & (BIT16 << (i*2)))
2376 isr_rdma(info->port_array[i]);
2377 if (gsr & (BIT17 << (i*2)))
2378 isr_tdma(info->port_array[i]);
2379 spin_unlock(&info->port_array[i]->lock);
2380 }
2381 }
2382
2383 if (info->gpio_present) {
2384 unsigned int state;
2385 unsigned int changed;
2386 spin_lock(&info->lock);
2387 while ((changed = rd_reg32(info, IOSR)) != 0) {
2388 DBGISR(("%s iosr=%08x\n", info->device_name, changed));
2389 /* read latched state of GPIO signals */
2390 state = rd_reg32(info, IOVR);
2391 /* clear pending GPIO interrupt bits */
2392 wr_reg32(info, IOSR, changed);
2393 for (i=0 ; i < info->port_count ; i++) {
2394 if (info->port_array[i] != NULL)
2395 isr_gpio(info->port_array[i], changed, state);
2396 }
2397 }
2398 spin_unlock(&info->lock);
2399 }
2400
2401 for(i=0; i < info->port_count ; i++) {
2402 struct slgt_info *port = info->port_array[i];
2403 if (port == NULL)
2404 continue;
2405 spin_lock(&port->lock);
2406 if ((port->port.count || port->netcount) &&
2407 port->pending_bh && !port->bh_running &&
2408 !port->bh_requested) {
2409 DBGISR(("%s bh queued\n", port->device_name));
2410 schedule_work(&port->task);
2411 port->bh_requested = true;
2412 }
2413 spin_unlock(&port->lock);
2414 }
2415
2416 DBGISR(("slgt_interrupt irq=%d exit\n", info->irq_level));
2417 return IRQ_HANDLED;
2418}
2419
2420static int startup(struct slgt_info *info)
2421{
2422 DBGINFO(("%s startup\n", info->device_name));
2423
2424 if (info->port.flags & ASYNC_INITIALIZED)
2425 return 0;
2426
2427 if (!info->tx_buf) {
2428 info->tx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
2429 if (!info->tx_buf) {
2430 DBGERR(("%s can't allocate tx buffer\n", info->device_name));
2431 return -ENOMEM;
2432 }
2433 }
2434
2435 info->pending_bh = 0;
2436
2437 memset(&info->icount, 0, sizeof(info->icount));
2438
2439 /* program hardware for current parameters */
2440 change_params(info);
2441
2442 if (info->port.tty)
2443 clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
2444
2445 info->port.flags |= ASYNC_INITIALIZED;
2446
2447 return 0;
2448}
2449
2450/*
2451 * called by close() and hangup() to shutdown hardware
2452 */
2453static void shutdown(struct slgt_info *info)
2454{
2455 unsigned long flags;
2456
2457 if (!(info->port.flags & ASYNC_INITIALIZED))
2458 return;
2459
2460 DBGINFO(("%s shutdown\n", info->device_name));
2461
2462 /* clear status wait queue because status changes */
2463 /* can't happen after shutting down the hardware */
2464 wake_up_interruptible(&info->status_event_wait_q);
2465 wake_up_interruptible(&info->event_wait_q);
2466
2467 del_timer_sync(&info->tx_timer);
2468 del_timer_sync(&info->rx_timer);
2469
2470 kfree(info->tx_buf);
2471 info->tx_buf = NULL;
2472
2473 spin_lock_irqsave(&info->lock,flags);
2474
2475 tx_stop(info);
2476 rx_stop(info);
2477
2478 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
2479
2480 if (!info->port.tty || info->port.tty->termios.c_cflag & HUPCL) {
2481 info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
2482 set_signals(info);
2483 }
2484
2485 flush_cond_wait(&info->gpio_wait_q);
2486
2487 spin_unlock_irqrestore(&info->lock,flags);
2488
2489 if (info->port.tty)
2490 set_bit(TTY_IO_ERROR, &info->port.tty->flags);
2491
2492 info->port.flags &= ~ASYNC_INITIALIZED;
2493}
2494
2495static void program_hw(struct slgt_info *info)
2496{
2497 unsigned long flags;
2498
2499 spin_lock_irqsave(&info->lock,flags);
2500
2501 rx_stop(info);
2502 tx_stop(info);
2503
2504 if (info->params.mode != MGSL_MODE_ASYNC ||
2505 info->netcount)
2506 sync_mode(info);
2507 else
2508 async_mode(info);
2509
2510 set_signals(info);
2511
2512 info->dcd_chkcount = 0;
2513 info->cts_chkcount = 0;
2514 info->ri_chkcount = 0;
2515 info->dsr_chkcount = 0;
2516
2517 slgt_irq_on(info, IRQ_DCD | IRQ_CTS | IRQ_DSR | IRQ_RI);
2518 get_signals(info);
2519
2520 if (info->netcount ||
2521 (info->port.tty && info->port.tty->termios.c_cflag & CREAD))
2522 rx_start(info);
2523
2524 spin_unlock_irqrestore(&info->lock,flags);
2525}
2526
2527/*
2528 * reconfigure adapter based on new parameters
2529 */
2530static void change_params(struct slgt_info *info)
2531{
2532 unsigned cflag;
2533 int bits_per_char;
2534
2535 if (!info->port.tty)
2536 return;
2537 DBGINFO(("%s change_params\n", info->device_name));
2538
2539 cflag = info->port.tty->termios.c_cflag;
2540
2541 /* if B0 rate (hangup) specified then negate RTS and DTR */
2542 /* otherwise assert RTS and DTR */
2543 if (cflag & CBAUD)
2544 info->signals |= SerialSignal_RTS | SerialSignal_DTR;
2545 else
2546 info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
2547
2548 /* byte size and parity */
2549
2550 switch (cflag & CSIZE) {
2551 case CS5: info->params.data_bits = 5; break;
2552 case CS6: info->params.data_bits = 6; break;
2553 case CS7: info->params.data_bits = 7; break;
2554 case CS8: info->params.data_bits = 8; break;
2555 default: info->params.data_bits = 7; break;
2556 }
2557
2558 info->params.stop_bits = (cflag & CSTOPB) ? 2 : 1;
2559
2560 if (cflag & PARENB)
2561 info->params.parity = (cflag & PARODD) ? ASYNC_PARITY_ODD : ASYNC_PARITY_EVEN;
2562 else
2563 info->params.parity = ASYNC_PARITY_NONE;
2564
2565 /* calculate number of jiffies to transmit a full
2566 * FIFO (32 bytes) at specified data rate
2567 */
2568 bits_per_char = info->params.data_bits +
2569 info->params.stop_bits + 1;
2570
2571 info->params.data_rate = tty_get_baud_rate(info->port.tty);
2572
2573 if (info->params.data_rate) {
2574 info->timeout = (32*HZ*bits_per_char) /
2575 info->params.data_rate;
2576 }
2577 info->timeout += HZ/50; /* Add .02 seconds of slop */
2578
2579 if (cflag & CRTSCTS)
2580 info->port.flags |= ASYNC_CTS_FLOW;
2581 else
2582 info->port.flags &= ~ASYNC_CTS_FLOW;
2583
2584 if (cflag & CLOCAL)
2585 info->port.flags &= ~ASYNC_CHECK_CD;
2586 else
2587 info->port.flags |= ASYNC_CHECK_CD;
2588
2589 /* process tty input control flags */
2590
2591 info->read_status_mask = IRQ_RXOVER;
2592 if (I_INPCK(info->port.tty))
2593 info->read_status_mask |= MASK_PARITY | MASK_FRAMING;
2594 if (I_BRKINT(info->port.tty) || I_PARMRK(info->port.tty))
2595 info->read_status_mask |= MASK_BREAK;
2596 if (I_IGNPAR(info->port.tty))
2597 info->ignore_status_mask |= MASK_PARITY | MASK_FRAMING;
2598 if (I_IGNBRK(info->port.tty)) {
2599 info->ignore_status_mask |= MASK_BREAK;
2600 /* If ignoring parity and break indicators, ignore
2601 * overruns too. (For real raw support).
2602 */
2603 if (I_IGNPAR(info->port.tty))
2604 info->ignore_status_mask |= MASK_OVERRUN;
2605 }
2606
2607 program_hw(info);
2608}
2609
2610static int get_stats(struct slgt_info *info, struct mgsl_icount __user *user_icount)
2611{
2612 DBGINFO(("%s get_stats\n", info->device_name));
2613 if (!user_icount) {
2614 memset(&info->icount, 0, sizeof(info->icount));
2615 } else {
2616 if (copy_to_user(user_icount, &info->icount, sizeof(struct mgsl_icount)))
2617 return -EFAULT;
2618 }
2619 return 0;
2620}
2621
2622static int get_params(struct slgt_info *info, MGSL_PARAMS __user *user_params)
2623{
2624 DBGINFO(("%s get_params\n", info->device_name));
2625 if (copy_to_user(user_params, &info->params, sizeof(MGSL_PARAMS)))
2626 return -EFAULT;
2627 return 0;
2628}
2629
2630static int set_params(struct slgt_info *info, MGSL_PARAMS __user *new_params)
2631{
2632 unsigned long flags;
2633 MGSL_PARAMS tmp_params;
2634
2635 DBGINFO(("%s set_params\n", info->device_name));
2636 if (copy_from_user(&tmp_params, new_params, sizeof(MGSL_PARAMS)))
2637 return -EFAULT;
2638
2639 spin_lock_irqsave(&info->lock, flags);
2640 if (tmp_params.mode == MGSL_MODE_BASE_CLOCK)
2641 info->base_clock = tmp_params.clock_speed;
2642 else
2643 memcpy(&info->params, &tmp_params, sizeof(MGSL_PARAMS));
2644 spin_unlock_irqrestore(&info->lock, flags);
2645
2646 program_hw(info);
2647
2648 return 0;
2649}
2650
2651static int get_txidle(struct slgt_info *info, int __user *idle_mode)
2652{
2653 DBGINFO(("%s get_txidle=%d\n", info->device_name, info->idle_mode));
2654 if (put_user(info->idle_mode, idle_mode))
2655 return -EFAULT;
2656 return 0;
2657}
2658
2659static int set_txidle(struct slgt_info *info, int idle_mode)
2660{
2661 unsigned long flags;
2662 DBGINFO(("%s set_txidle(%d)\n", info->device_name, idle_mode));
2663 spin_lock_irqsave(&info->lock,flags);
2664 info->idle_mode = idle_mode;
2665 if (info->params.mode != MGSL_MODE_ASYNC)
2666 tx_set_idle(info);
2667 spin_unlock_irqrestore(&info->lock,flags);
2668 return 0;
2669}
2670
2671static int tx_enable(struct slgt_info *info, int enable)
2672{
2673 unsigned long flags;
2674 DBGINFO(("%s tx_enable(%d)\n", info->device_name, enable));
2675 spin_lock_irqsave(&info->lock,flags);
2676 if (enable) {
2677 if (!info->tx_enabled)
2678 tx_start(info);
2679 } else {
2680 if (info->tx_enabled)
2681 tx_stop(info);
2682 }
2683 spin_unlock_irqrestore(&info->lock,flags);
2684 return 0;
2685}
2686
2687/*
2688 * abort transmit HDLC frame
2689 */
2690static int tx_abort(struct slgt_info *info)
2691{
2692 unsigned long flags;
2693 DBGINFO(("%s tx_abort\n", info->device_name));
2694 spin_lock_irqsave(&info->lock,flags);
2695 tdma_reset(info);
2696 spin_unlock_irqrestore(&info->lock,flags);
2697 return 0;
2698}
2699
2700static int rx_enable(struct slgt_info *info, int enable)
2701{
2702 unsigned long flags;
2703 unsigned int rbuf_fill_level;
2704 DBGINFO(("%s rx_enable(%08x)\n", info->device_name, enable));
2705 spin_lock_irqsave(&info->lock,flags);
2706 /*
2707 * enable[31..16] = receive DMA buffer fill level
2708 * 0 = noop (leave fill level unchanged)
2709 * fill level must be multiple of 4 and <= buffer size
2710 */
2711 rbuf_fill_level = ((unsigned int)enable) >> 16;
2712 if (rbuf_fill_level) {
2713 if ((rbuf_fill_level > DMABUFSIZE) || (rbuf_fill_level % 4)) {
2714 spin_unlock_irqrestore(&info->lock, flags);
2715 return -EINVAL;
2716 }
2717 info->rbuf_fill_level = rbuf_fill_level;
2718 if (rbuf_fill_level < 128)
2719 info->rx_pio = 1; /* PIO mode */
2720 else
2721 info->rx_pio = 0; /* DMA mode */
2722 rx_stop(info); /* restart receiver to use new fill level */
2723 }
2724
2725 /*
2726 * enable[1..0] = receiver enable command
2727 * 0 = disable
2728 * 1 = enable
2729 * 2 = enable or force hunt mode if already enabled
2730 */
2731 enable &= 3;
2732 if (enable) {
2733 if (!info->rx_enabled)
2734 rx_start(info);
2735 else if (enable == 2) {
2736 /* force hunt mode (write 1 to RCR[3]) */
2737 wr_reg16(info, RCR, rd_reg16(info, RCR) | BIT3);
2738 }
2739 } else {
2740 if (info->rx_enabled)
2741 rx_stop(info);
2742 }
2743 spin_unlock_irqrestore(&info->lock,flags);
2744 return 0;
2745}
2746
2747/*
2748 * wait for specified event to occur
2749 */
2750static int wait_mgsl_event(struct slgt_info *info, int __user *mask_ptr)
2751{
2752 unsigned long flags;
2753 int s;
2754 int rc=0;
2755 struct mgsl_icount cprev, cnow;
2756 int events;
2757 int mask;
2758 struct _input_signal_events oldsigs, newsigs;
2759 DECLARE_WAITQUEUE(wait, current);
2760
2761 if (get_user(mask, mask_ptr))
2762 return -EFAULT;
2763
2764 DBGINFO(("%s wait_mgsl_event(%d)\n", info->device_name, mask));
2765
2766 spin_lock_irqsave(&info->lock,flags);
2767
2768 /* return immediately if state matches requested events */
2769 get_signals(info);
2770 s = info->signals;
2771
2772 events = mask &
2773 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
2774 ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
2775 ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
2776 ((s & SerialSignal_RI) ? MgslEvent_RiActive :MgslEvent_RiInactive) );
2777 if (events) {
2778 spin_unlock_irqrestore(&info->lock,flags);
2779 goto exit;
2780 }
2781
2782 /* save current irq counts */
2783 cprev = info->icount;
2784 oldsigs = info->input_signal_events;
2785
2786 /* enable hunt and idle irqs if needed */
2787 if (mask & (MgslEvent_ExitHuntMode+MgslEvent_IdleReceived)) {
2788 unsigned short val = rd_reg16(info, SCR);
2789 if (!(val & IRQ_RXIDLE))
2790 wr_reg16(info, SCR, (unsigned short)(val | IRQ_RXIDLE));
2791 }
2792
2793 set_current_state(TASK_INTERRUPTIBLE);
2794 add_wait_queue(&info->event_wait_q, &wait);
2795
2796 spin_unlock_irqrestore(&info->lock,flags);
2797
2798 for(;;) {
2799 schedule();
2800 if (signal_pending(current)) {
2801 rc = -ERESTARTSYS;
2802 break;
2803 }
2804
2805 /* get current irq counts */
2806 spin_lock_irqsave(&info->lock,flags);
2807 cnow = info->icount;
2808 newsigs = info->input_signal_events;
2809 set_current_state(TASK_INTERRUPTIBLE);
2810 spin_unlock_irqrestore(&info->lock,flags);
2811
2812 /* if no change, wait aborted for some reason */
2813 if (newsigs.dsr_up == oldsigs.dsr_up &&
2814 newsigs.dsr_down == oldsigs.dsr_down &&
2815 newsigs.dcd_up == oldsigs.dcd_up &&
2816 newsigs.dcd_down == oldsigs.dcd_down &&
2817 newsigs.cts_up == oldsigs.cts_up &&
2818 newsigs.cts_down == oldsigs.cts_down &&
2819 newsigs.ri_up == oldsigs.ri_up &&
2820 newsigs.ri_down == oldsigs.ri_down &&
2821 cnow.exithunt == cprev.exithunt &&
2822 cnow.rxidle == cprev.rxidle) {
2823 rc = -EIO;
2824 break;
2825 }
2826
2827 events = mask &
2828 ( (newsigs.dsr_up != oldsigs.dsr_up ? MgslEvent_DsrActive:0) +
2829 (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
2830 (newsigs.dcd_up != oldsigs.dcd_up ? MgslEvent_DcdActive:0) +
2831 (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
2832 (newsigs.cts_up != oldsigs.cts_up ? MgslEvent_CtsActive:0) +
2833 (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
2834 (newsigs.ri_up != oldsigs.ri_up ? MgslEvent_RiActive:0) +
2835 (newsigs.ri_down != oldsigs.ri_down ? MgslEvent_RiInactive:0) +
2836 (cnow.exithunt != cprev.exithunt ? MgslEvent_ExitHuntMode:0) +
2837 (cnow.rxidle != cprev.rxidle ? MgslEvent_IdleReceived:0) );
2838 if (events)
2839 break;
2840
2841 cprev = cnow;
2842 oldsigs = newsigs;
2843 }
2844
2845 remove_wait_queue(&info->event_wait_q, &wait);
2846 set_current_state(TASK_RUNNING);
2847
2848
2849 if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
2850 spin_lock_irqsave(&info->lock,flags);
2851 if (!waitqueue_active(&info->event_wait_q)) {
2852 /* disable enable exit hunt mode/idle rcvd IRQs */
2853 wr_reg16(info, SCR,
2854 (unsigned short)(rd_reg16(info, SCR) & ~IRQ_RXIDLE));
2855 }
2856 spin_unlock_irqrestore(&info->lock,flags);
2857 }
2858exit:
2859 if (rc == 0)
2860 rc = put_user(events, mask_ptr);
2861 return rc;
2862}
2863
2864static int get_interface(struct slgt_info *info, int __user *if_mode)
2865{
2866 DBGINFO(("%s get_interface=%x\n", info->device_name, info->if_mode));
2867 if (put_user(info->if_mode, if_mode))
2868 return -EFAULT;
2869 return 0;
2870}
2871
2872static int set_interface(struct slgt_info *info, int if_mode)
2873{
2874 unsigned long flags;
2875 unsigned short val;
2876
2877 DBGINFO(("%s set_interface=%x)\n", info->device_name, if_mode));
2878 spin_lock_irqsave(&info->lock,flags);
2879 info->if_mode = if_mode;
2880
2881 msc_set_vcr(info);
2882
2883 /* TCR (tx control) 07 1=RTS driver control */
2884 val = rd_reg16(info, TCR);
2885 if (info->if_mode & MGSL_INTERFACE_RTS_EN)
2886 val |= BIT7;
2887 else
2888 val &= ~BIT7;
2889 wr_reg16(info, TCR, val);
2890
2891 spin_unlock_irqrestore(&info->lock,flags);
2892 return 0;
2893}
2894
2895static int get_xsync(struct slgt_info *info, int __user *xsync)
2896{
2897 DBGINFO(("%s get_xsync=%x\n", info->device_name, info->xsync));
2898 if (put_user(info->xsync, xsync))
2899 return -EFAULT;
2900 return 0;
2901}
2902
2903/*
2904 * set extended sync pattern (1 to 4 bytes) for extended sync mode
2905 *
2906 * sync pattern is contained in least significant bytes of value
2907 * most significant byte of sync pattern is oldest (1st sent/detected)
2908 */
2909static int set_xsync(struct slgt_info *info, int xsync)
2910{
2911 unsigned long flags;
2912
2913 DBGINFO(("%s set_xsync=%x)\n", info->device_name, xsync));
2914 spin_lock_irqsave(&info->lock, flags);
2915 info->xsync = xsync;
2916 wr_reg32(info, XSR, xsync);
2917 spin_unlock_irqrestore(&info->lock, flags);
2918 return 0;
2919}
2920
2921static int get_xctrl(struct slgt_info *info, int __user *xctrl)
2922{
2923 DBGINFO(("%s get_xctrl=%x\n", info->device_name, info->xctrl));
2924 if (put_user(info->xctrl, xctrl))
2925 return -EFAULT;
2926 return 0;
2927}
2928
2929/*
2930 * set extended control options
2931 *
2932 * xctrl[31:19] reserved, must be zero
2933 * xctrl[18:17] extended sync pattern length in bytes
2934 * 00 = 1 byte in xsr[7:0]
2935 * 01 = 2 bytes in xsr[15:0]
2936 * 10 = 3 bytes in xsr[23:0]
2937 * 11 = 4 bytes in xsr[31:0]
2938 * xctrl[16] 1 = enable terminal count, 0=disabled
2939 * xctrl[15:0] receive terminal count for fixed length packets
2940 * value is count minus one (0 = 1 byte packet)
2941 * when terminal count is reached, receiver
2942 * automatically returns to hunt mode and receive
2943 * FIFO contents are flushed to DMA buffers with
2944 * end of frame (EOF) status
2945 */
2946static int set_xctrl(struct slgt_info *info, int xctrl)
2947{
2948 unsigned long flags;
2949
2950 DBGINFO(("%s set_xctrl=%x)\n", info->device_name, xctrl));
2951 spin_lock_irqsave(&info->lock, flags);
2952 info->xctrl = xctrl;
2953 wr_reg32(info, XCR, xctrl);
2954 spin_unlock_irqrestore(&info->lock, flags);
2955 return 0;
2956}
2957
2958/*
2959 * set general purpose IO pin state and direction
2960 *
2961 * user_gpio fields:
2962 * state each bit indicates a pin state
2963 * smask set bit indicates pin state to set
2964 * dir each bit indicates a pin direction (0=input, 1=output)
2965 * dmask set bit indicates pin direction to set
2966 */
2967static int set_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
2968{
2969 unsigned long flags;
2970 struct gpio_desc gpio;
2971 __u32 data;
2972
2973 if (!info->gpio_present)
2974 return -EINVAL;
2975 if (copy_from_user(&gpio, user_gpio, sizeof(gpio)))
2976 return -EFAULT;
2977 DBGINFO(("%s set_gpio state=%08x smask=%08x dir=%08x dmask=%08x\n",
2978 info->device_name, gpio.state, gpio.smask,
2979 gpio.dir, gpio.dmask));
2980
2981 spin_lock_irqsave(&info->port_array[0]->lock, flags);
2982 if (gpio.dmask) {
2983 data = rd_reg32(info, IODR);
2984 data |= gpio.dmask & gpio.dir;
2985 data &= ~(gpio.dmask & ~gpio.dir);
2986 wr_reg32(info, IODR, data);
2987 }
2988 if (gpio.smask) {
2989 data = rd_reg32(info, IOVR);
2990 data |= gpio.smask & gpio.state;
2991 data &= ~(gpio.smask & ~gpio.state);
2992 wr_reg32(info, IOVR, data);
2993 }
2994 spin_unlock_irqrestore(&info->port_array[0]->lock, flags);
2995
2996 return 0;
2997}
2998
2999/*
3000 * get general purpose IO pin state and direction
3001 */
3002static int get_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
3003{
3004 struct gpio_desc gpio;
3005 if (!info->gpio_present)
3006 return -EINVAL;
3007 gpio.state = rd_reg32(info, IOVR);
3008 gpio.smask = 0xffffffff;
3009 gpio.dir = rd_reg32(info, IODR);
3010 gpio.dmask = 0xffffffff;
3011 if (copy_to_user(user_gpio, &gpio, sizeof(gpio)))
3012 return -EFAULT;
3013 DBGINFO(("%s get_gpio state=%08x dir=%08x\n",
3014 info->device_name, gpio.state, gpio.dir));
3015 return 0;
3016}
3017
3018/*
3019 * conditional wait facility
3020 */
3021static void init_cond_wait(struct cond_wait *w, unsigned int data)
3022{
3023 init_waitqueue_head(&w->q);
3024 init_waitqueue_entry(&w->wait, current);
3025 w->data = data;
3026}
3027
3028static void add_cond_wait(struct cond_wait **head, struct cond_wait *w)
3029{
3030 set_current_state(TASK_INTERRUPTIBLE);
3031 add_wait_queue(&w->q, &w->wait);
3032 w->next = *head;
3033 *head = w;
3034}
3035
3036static void remove_cond_wait(struct cond_wait **head, struct cond_wait *cw)
3037{
3038 struct cond_wait *w, *prev;
3039 remove_wait_queue(&cw->q, &cw->wait);
3040 set_current_state(TASK_RUNNING);
3041 for (w = *head, prev = NULL ; w != NULL ; prev = w, w = w->next) {
3042 if (w == cw) {
3043 if (prev != NULL)
3044 prev->next = w->next;
3045 else
3046 *head = w->next;
3047 break;
3048 }
3049 }
3050}
3051
3052static void flush_cond_wait(struct cond_wait **head)
3053{
3054 while (*head != NULL) {
3055 wake_up_interruptible(&(*head)->q);
3056 *head = (*head)->next;
3057 }
3058}
3059
3060/*
3061 * wait for general purpose I/O pin(s) to enter specified state
3062 *
3063 * user_gpio fields:
3064 * state - bit indicates target pin state
3065 * smask - set bit indicates watched pin
3066 *
3067 * The wait ends when at least one watched pin enters the specified
3068 * state. When 0 (no error) is returned, user_gpio->state is set to the
3069 * state of all GPIO pins when the wait ends.
3070 *
3071 * Note: Each pin may be a dedicated input, dedicated output, or
3072 * configurable input/output. The number and configuration of pins
3073 * varies with the specific adapter model. Only input pins (dedicated
3074 * or configured) can be monitored with this function.
3075 */
3076static int wait_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
3077{
3078 unsigned long flags;
3079 int rc = 0;
3080 struct gpio_desc gpio;
3081 struct cond_wait wait;
3082 u32 state;
3083
3084 if (!info->gpio_present)
3085 return -EINVAL;
3086 if (copy_from_user(&gpio, user_gpio, sizeof(gpio)))
3087 return -EFAULT;
3088 DBGINFO(("%s wait_gpio() state=%08x smask=%08x\n",
3089 info->device_name, gpio.state, gpio.smask));
3090 /* ignore output pins identified by set IODR bit */
3091 if ((gpio.smask &= ~rd_reg32(info, IODR)) == 0)
3092 return -EINVAL;
3093 init_cond_wait(&wait, gpio.smask);
3094
3095 spin_lock_irqsave(&info->port_array[0]->lock, flags);
3096 /* enable interrupts for watched pins */
3097 wr_reg32(info, IOER, rd_reg32(info, IOER) | gpio.smask);
3098 /* get current pin states */
3099 state = rd_reg32(info, IOVR);
3100
3101 if (gpio.smask & ~(state ^ gpio.state)) {
3102 /* already in target state */
3103 gpio.state = state;
3104 } else {
3105 /* wait for target state */
3106 add_cond_wait(&info->gpio_wait_q, &wait);
3107 spin_unlock_irqrestore(&info->port_array[0]->lock, flags);
3108 schedule();
3109 if (signal_pending(current))
3110 rc = -ERESTARTSYS;
3111 else
3112 gpio.state = wait.data;
3113 spin_lock_irqsave(&info->port_array[0]->lock, flags);
3114 remove_cond_wait(&info->gpio_wait_q, &wait);
3115 }
3116
3117 /* disable all GPIO interrupts if no waiting processes */
3118 if (info->gpio_wait_q == NULL)
3119 wr_reg32(info, IOER, 0);
3120 spin_unlock_irqrestore(&info->port_array[0]->lock, flags);
3121
3122 if ((rc == 0) && copy_to_user(user_gpio, &gpio, sizeof(gpio)))
3123 rc = -EFAULT;
3124 return rc;
3125}
3126
3127static int modem_input_wait(struct slgt_info *info,int arg)
3128{
3129 unsigned long flags;
3130 int rc;
3131 struct mgsl_icount cprev, cnow;
3132 DECLARE_WAITQUEUE(wait, current);
3133
3134 /* save current irq counts */
3135 spin_lock_irqsave(&info->lock,flags);
3136 cprev = info->icount;
3137 add_wait_queue(&info->status_event_wait_q, &wait);
3138 set_current_state(TASK_INTERRUPTIBLE);
3139 spin_unlock_irqrestore(&info->lock,flags);
3140
3141 for(;;) {
3142 schedule();
3143 if (signal_pending(current)) {
3144 rc = -ERESTARTSYS;
3145 break;
3146 }
3147
3148 /* get new irq counts */
3149 spin_lock_irqsave(&info->lock,flags);
3150 cnow = info->icount;
3151 set_current_state(TASK_INTERRUPTIBLE);
3152 spin_unlock_irqrestore(&info->lock,flags);
3153
3154 /* if no change, wait aborted for some reason */
3155 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
3156 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
3157 rc = -EIO;
3158 break;
3159 }
3160
3161 /* check for change in caller specified modem input */
3162 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
3163 (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
3164 (arg & TIOCM_CD && cnow.dcd != cprev.dcd) ||
3165 (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
3166 rc = 0;
3167 break;
3168 }
3169
3170 cprev = cnow;
3171 }
3172 remove_wait_queue(&info->status_event_wait_q, &wait);
3173 set_current_state(TASK_RUNNING);
3174 return rc;
3175}
3176
3177/*
3178 * return state of serial control and status signals
3179 */
3180static int tiocmget(struct tty_struct *tty)
3181{
3182 struct slgt_info *info = tty->driver_data;
3183 unsigned int result;
3184 unsigned long flags;
3185
3186 spin_lock_irqsave(&info->lock,flags);
3187 get_signals(info);
3188 spin_unlock_irqrestore(&info->lock,flags);
3189
3190 result = ((info->signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
3191 ((info->signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
3192 ((info->signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
3193 ((info->signals & SerialSignal_RI) ? TIOCM_RNG:0) +
3194 ((info->signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
3195 ((info->signals & SerialSignal_CTS) ? TIOCM_CTS:0);
3196
3197 DBGINFO(("%s tiocmget value=%08X\n", info->device_name, result));
3198 return result;
3199}
3200
3201/*
3202 * set modem control signals (DTR/RTS)
3203 *
3204 * cmd signal command: TIOCMBIS = set bit TIOCMBIC = clear bit
3205 * TIOCMSET = set/clear signal values
3206 * value bit mask for command
3207 */
3208static int tiocmset(struct tty_struct *tty,
3209 unsigned int set, unsigned int clear)
3210{
3211 struct slgt_info *info = tty->driver_data;
3212 unsigned long flags;
3213
3214 DBGINFO(("%s tiocmset(%x,%x)\n", info->device_name, set, clear));
3215
3216 if (set & TIOCM_RTS)
3217 info->signals |= SerialSignal_RTS;
3218 if (set & TIOCM_DTR)
3219 info->signals |= SerialSignal_DTR;
3220 if (clear & TIOCM_RTS)
3221 info->signals &= ~SerialSignal_RTS;
3222 if (clear & TIOCM_DTR)
3223 info->signals &= ~SerialSignal_DTR;
3224
3225 spin_lock_irqsave(&info->lock,flags);
3226 set_signals(info);
3227 spin_unlock_irqrestore(&info->lock,flags);
3228 return 0;
3229}
3230
3231static int carrier_raised(struct tty_port *port)
3232{
3233 unsigned long flags;
3234 struct slgt_info *info = container_of(port, struct slgt_info, port);
3235
3236 spin_lock_irqsave(&info->lock,flags);
3237 get_signals(info);
3238 spin_unlock_irqrestore(&info->lock,flags);
3239 return (info->signals & SerialSignal_DCD) ? 1 : 0;
3240}
3241
3242static void dtr_rts(struct tty_port *port, int on)
3243{
3244 unsigned long flags;
3245 struct slgt_info *info = container_of(port, struct slgt_info, port);
3246
3247 spin_lock_irqsave(&info->lock,flags);
3248 if (on)
3249 info->signals |= SerialSignal_RTS | SerialSignal_DTR;
3250 else
3251 info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
3252 set_signals(info);
3253 spin_unlock_irqrestore(&info->lock,flags);
3254}
3255
3256
3257/*
3258 * block current process until the device is ready to open
3259 */
3260static int block_til_ready(struct tty_struct *tty, struct file *filp,
3261 struct slgt_info *info)
3262{
3263 DECLARE_WAITQUEUE(wait, current);
3264 int retval;
3265 bool do_clocal = false;
3266 unsigned long flags;
3267 int cd;
3268 struct tty_port *port = &info->port;
3269
3270 DBGINFO(("%s block_til_ready\n", tty->driver->name));
3271
3272 if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
3273 /* nonblock mode is set or port is not enabled */
3274 port->flags |= ASYNC_NORMAL_ACTIVE;
3275 return 0;
3276 }
3277
3278 if (C_CLOCAL(tty))
3279 do_clocal = true;
3280
3281 /* Wait for carrier detect and the line to become
3282 * free (i.e., not in use by the callout). While we are in
3283 * this loop, port->count is dropped by one, so that
3284 * close() knows when to free things. We restore it upon
3285 * exit, either normal or abnormal.
3286 */
3287
3288 retval = 0;
3289 add_wait_queue(&port->open_wait, &wait);
3290
3291 spin_lock_irqsave(&info->lock, flags);
3292 port->count--;
3293 spin_unlock_irqrestore(&info->lock, flags);
3294 port->blocked_open++;
3295
3296 while (1) {
3297 if (C_BAUD(tty) && test_bit(ASYNCB_INITIALIZED, &port->flags))
3298 tty_port_raise_dtr_rts(port);
3299
3300 set_current_state(TASK_INTERRUPTIBLE);
3301
3302 if (tty_hung_up_p(filp) || !(port->flags & ASYNC_INITIALIZED)){
3303 retval = (port->flags & ASYNC_HUP_NOTIFY) ?
3304 -EAGAIN : -ERESTARTSYS;
3305 break;
3306 }
3307
3308 cd = tty_port_carrier_raised(port);
3309 if (do_clocal || cd)
3310 break;
3311
3312 if (signal_pending(current)) {
3313 retval = -ERESTARTSYS;
3314 break;
3315 }
3316
3317 DBGINFO(("%s block_til_ready wait\n", tty->driver->name));
3318 tty_unlock(tty);
3319 schedule();
3320 tty_lock(tty);
3321 }
3322
3323 set_current_state(TASK_RUNNING);
3324 remove_wait_queue(&port->open_wait, &wait);
3325
3326 if (!tty_hung_up_p(filp))
3327 port->count++;
3328 port->blocked_open--;
3329
3330 if (!retval)
3331 port->flags |= ASYNC_NORMAL_ACTIVE;
3332
3333 DBGINFO(("%s block_til_ready ready, rc=%d\n", tty->driver->name, retval));
3334 return retval;
3335}
3336
3337/*
3338 * allocate buffers used for calling line discipline receive_buf
3339 * directly in synchronous mode
3340 * note: add 5 bytes to max frame size to allow appending
3341 * 32-bit CRC and status byte when configured to do so
3342 */
3343static int alloc_tmp_rbuf(struct slgt_info *info)
3344{
3345 info->tmp_rbuf = kmalloc(info->max_frame_size + 5, GFP_KERNEL);
3346 if (info->tmp_rbuf == NULL)
3347 return -ENOMEM;
3348 /* unused flag buffer to satisfy receive_buf calling interface */
3349 info->flag_buf = kzalloc(info->max_frame_size + 5, GFP_KERNEL);
3350 if (!info->flag_buf) {
3351 kfree(info->tmp_rbuf);
3352 info->tmp_rbuf = NULL;
3353 return -ENOMEM;
3354 }
3355 return 0;
3356}
3357
3358static void free_tmp_rbuf(struct slgt_info *info)
3359{
3360 kfree(info->tmp_rbuf);
3361 info->tmp_rbuf = NULL;
3362 kfree(info->flag_buf);
3363 info->flag_buf = NULL;
3364}
3365
3366/*
3367 * allocate DMA descriptor lists.
3368 */
3369static int alloc_desc(struct slgt_info *info)
3370{
3371 unsigned int i;
3372 unsigned int pbufs;
3373
3374 /* allocate memory to hold descriptor lists */
3375 info->bufs = pci_zalloc_consistent(info->pdev, DESC_LIST_SIZE,
3376 &info->bufs_dma_addr);
3377 if (info->bufs == NULL)
3378 return -ENOMEM;
3379
3380 info->rbufs = (struct slgt_desc*)info->bufs;
3381 info->tbufs = ((struct slgt_desc*)info->bufs) + info->rbuf_count;
3382
3383 pbufs = (unsigned int)info->bufs_dma_addr;
3384
3385 /*
3386 * Build circular lists of descriptors
3387 */
3388
3389 for (i=0; i < info->rbuf_count; i++) {
3390 /* physical address of this descriptor */
3391 info->rbufs[i].pdesc = pbufs + (i * sizeof(struct slgt_desc));
3392
3393 /* physical address of next descriptor */
3394 if (i == info->rbuf_count - 1)
3395 info->rbufs[i].next = cpu_to_le32(pbufs);
3396 else
3397 info->rbufs[i].next = cpu_to_le32(pbufs + ((i+1) * sizeof(struct slgt_desc)));
3398 set_desc_count(info->rbufs[i], DMABUFSIZE);
3399 }
3400
3401 for (i=0; i < info->tbuf_count; i++) {
3402 /* physical address of this descriptor */
3403 info->tbufs[i].pdesc = pbufs + ((info->rbuf_count + i) * sizeof(struct slgt_desc));
3404
3405 /* physical address of next descriptor */
3406 if (i == info->tbuf_count - 1)
3407 info->tbufs[i].next = cpu_to_le32(pbufs + info->rbuf_count * sizeof(struct slgt_desc));
3408 else
3409 info->tbufs[i].next = cpu_to_le32(pbufs + ((info->rbuf_count + i + 1) * sizeof(struct slgt_desc)));
3410 }
3411
3412 return 0;
3413}
3414
3415static void free_desc(struct slgt_info *info)
3416{
3417 if (info->bufs != NULL) {
3418 pci_free_consistent(info->pdev, DESC_LIST_SIZE, info->bufs, info->bufs_dma_addr);
3419 info->bufs = NULL;
3420 info->rbufs = NULL;
3421 info->tbufs = NULL;
3422 }
3423}
3424
3425static int alloc_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count)
3426{
3427 int i;
3428 for (i=0; i < count; i++) {
3429 if ((bufs[i].buf = pci_alloc_consistent(info->pdev, DMABUFSIZE, &bufs[i].buf_dma_addr)) == NULL)
3430 return -ENOMEM;
3431 bufs[i].pbuf = cpu_to_le32((unsigned int)bufs[i].buf_dma_addr);
3432 }
3433 return 0;
3434}
3435
3436static void free_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count)
3437{
3438 int i;
3439 for (i=0; i < count; i++) {
3440 if (bufs[i].buf == NULL)
3441 continue;
3442 pci_free_consistent(info->pdev, DMABUFSIZE, bufs[i].buf, bufs[i].buf_dma_addr);
3443 bufs[i].buf = NULL;
3444 }
3445}
3446
3447static int alloc_dma_bufs(struct slgt_info *info)
3448{
3449 info->rbuf_count = 32;
3450 info->tbuf_count = 32;
3451
3452 if (alloc_desc(info) < 0 ||
3453 alloc_bufs(info, info->rbufs, info->rbuf_count) < 0 ||
3454 alloc_bufs(info, info->tbufs, info->tbuf_count) < 0 ||
3455 alloc_tmp_rbuf(info) < 0) {
3456 DBGERR(("%s DMA buffer alloc fail\n", info->device_name));
3457 return -ENOMEM;
3458 }
3459 reset_rbufs(info);
3460 return 0;
3461}
3462
3463static void free_dma_bufs(struct slgt_info *info)
3464{
3465 if (info->bufs) {
3466 free_bufs(info, info->rbufs, info->rbuf_count);
3467 free_bufs(info, info->tbufs, info->tbuf_count);
3468 free_desc(info);
3469 }
3470 free_tmp_rbuf(info);
3471}
3472
3473static int claim_resources(struct slgt_info *info)
3474{
3475 if (request_mem_region(info->phys_reg_addr, SLGT_REG_SIZE, "synclink_gt") == NULL) {
3476 DBGERR(("%s reg addr conflict, addr=%08X\n",
3477 info->device_name, info->phys_reg_addr));
3478 info->init_error = DiagStatus_AddressConflict;
3479 goto errout;
3480 }
3481 else
3482 info->reg_addr_requested = true;
3483
3484 info->reg_addr = ioremap_nocache(info->phys_reg_addr, SLGT_REG_SIZE);
3485 if (!info->reg_addr) {
3486 DBGERR(("%s can't map device registers, addr=%08X\n",
3487 info->device_name, info->phys_reg_addr));
3488 info->init_error = DiagStatus_CantAssignPciResources;
3489 goto errout;
3490 }
3491 return 0;
3492
3493errout:
3494 release_resources(info);
3495 return -ENODEV;
3496}
3497
3498static void release_resources(struct slgt_info *info)
3499{
3500 if (info->irq_requested) {
3501 free_irq(info->irq_level, info);
3502 info->irq_requested = false;
3503 }
3504
3505 if (info->reg_addr_requested) {
3506 release_mem_region(info->phys_reg_addr, SLGT_REG_SIZE);
3507 info->reg_addr_requested = false;
3508 }
3509
3510 if (info->reg_addr) {
3511 iounmap(info->reg_addr);
3512 info->reg_addr = NULL;
3513 }
3514}
3515
3516/* Add the specified device instance data structure to the
3517 * global linked list of devices and increment the device count.
3518 */
3519static void add_device(struct slgt_info *info)
3520{
3521 char *devstr;
3522
3523 info->next_device = NULL;
3524 info->line = slgt_device_count;
3525 sprintf(info->device_name, "%s%d", tty_dev_prefix, info->line);
3526
3527 if (info->line < MAX_DEVICES) {
3528 if (maxframe[info->line])
3529 info->max_frame_size = maxframe[info->line];
3530 }
3531
3532 slgt_device_count++;
3533
3534 if (!slgt_device_list)
3535 slgt_device_list = info;
3536 else {
3537 struct slgt_info *current_dev = slgt_device_list;
3538 while(current_dev->next_device)
3539 current_dev = current_dev->next_device;
3540 current_dev->next_device = info;
3541 }
3542
3543 if (info->max_frame_size < 4096)
3544 info->max_frame_size = 4096;
3545 else if (info->max_frame_size > 65535)
3546 info->max_frame_size = 65535;
3547
3548 switch(info->pdev->device) {
3549 case SYNCLINK_GT_DEVICE_ID:
3550 devstr = "GT";
3551 break;
3552 case SYNCLINK_GT2_DEVICE_ID:
3553 devstr = "GT2";
3554 break;
3555 case SYNCLINK_GT4_DEVICE_ID:
3556 devstr = "GT4";
3557 break;
3558 case SYNCLINK_AC_DEVICE_ID:
3559 devstr = "AC";
3560 info->params.mode = MGSL_MODE_ASYNC;
3561 break;
3562 default:
3563 devstr = "(unknown model)";
3564 }
3565 printk("SyncLink %s %s IO=%08x IRQ=%d MaxFrameSize=%u\n",
3566 devstr, info->device_name, info->phys_reg_addr,
3567 info->irq_level, info->max_frame_size);
3568
3569#if SYNCLINK_GENERIC_HDLC
3570 hdlcdev_init(info);
3571#endif
3572}
3573
3574static const struct tty_port_operations slgt_port_ops = {
3575 .carrier_raised = carrier_raised,
3576 .dtr_rts = dtr_rts,
3577};
3578
3579/*
3580 * allocate device instance structure, return NULL on failure
3581 */
3582static struct slgt_info *alloc_dev(int adapter_num, int port_num, struct pci_dev *pdev)
3583{
3584 struct slgt_info *info;
3585
3586 info = kzalloc(sizeof(struct slgt_info), GFP_KERNEL);
3587
3588 if (!info) {
3589 DBGERR(("%s device alloc failed adapter=%d port=%d\n",
3590 driver_name, adapter_num, port_num));
3591 } else {
3592 tty_port_init(&info->port);
3593 info->port.ops = &slgt_port_ops;
3594 info->magic = MGSL_MAGIC;
3595 INIT_WORK(&info->task, bh_handler);
3596 info->max_frame_size = 4096;
3597 info->base_clock = 14745600;
3598 info->rbuf_fill_level = DMABUFSIZE;
3599 info->port.close_delay = 5*HZ/10;
3600 info->port.closing_wait = 30*HZ;
3601 init_waitqueue_head(&info->status_event_wait_q);
3602 init_waitqueue_head(&info->event_wait_q);
3603 spin_lock_init(&info->netlock);
3604 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
3605 info->idle_mode = HDLC_TXIDLE_FLAGS;
3606 info->adapter_num = adapter_num;
3607 info->port_num = port_num;
3608
3609 setup_timer(&info->tx_timer, tx_timeout, (unsigned long)info);
3610 setup_timer(&info->rx_timer, rx_timeout, (unsigned long)info);
3611
3612 /* Copy configuration info to device instance data */
3613 info->pdev = pdev;
3614 info->irq_level = pdev->irq;
3615 info->phys_reg_addr = pci_resource_start(pdev,0);
3616
3617 info->bus_type = MGSL_BUS_TYPE_PCI;
3618 info->irq_flags = IRQF_SHARED;
3619
3620 info->init_error = -1; /* assume error, set to 0 on successful init */
3621 }
3622
3623 return info;
3624}
3625
3626static void device_init(int adapter_num, struct pci_dev *pdev)
3627{
3628 struct slgt_info *port_array[SLGT_MAX_PORTS];
3629 int i;
3630 int port_count = 1;
3631
3632 if (pdev->device == SYNCLINK_GT2_DEVICE_ID)
3633 port_count = 2;
3634 else if (pdev->device == SYNCLINK_GT4_DEVICE_ID)
3635 port_count = 4;
3636
3637 /* allocate device instances for all ports */
3638 for (i=0; i < port_count; ++i) {
3639 port_array[i] = alloc_dev(adapter_num, i, pdev);
3640 if (port_array[i] == NULL) {
3641 for (--i; i >= 0; --i) {
3642 tty_port_destroy(&port_array[i]->port);
3643 kfree(port_array[i]);
3644 }
3645 return;
3646 }
3647 }
3648
3649 /* give copy of port_array to all ports and add to device list */
3650 for (i=0; i < port_count; ++i) {
3651 memcpy(port_array[i]->port_array, port_array, sizeof(port_array));
3652 add_device(port_array[i]);
3653 port_array[i]->port_count = port_count;
3654 spin_lock_init(&port_array[i]->lock);
3655 }
3656
3657 /* Allocate and claim adapter resources */
3658 if (!claim_resources(port_array[0])) {
3659
3660 alloc_dma_bufs(port_array[0]);
3661
3662 /* copy resource information from first port to others */
3663 for (i = 1; i < port_count; ++i) {
3664 port_array[i]->irq_level = port_array[0]->irq_level;
3665 port_array[i]->reg_addr = port_array[0]->reg_addr;
3666 alloc_dma_bufs(port_array[i]);
3667 }
3668
3669 if (request_irq(port_array[0]->irq_level,
3670 slgt_interrupt,
3671 port_array[0]->irq_flags,
3672 port_array[0]->device_name,
3673 port_array[0]) < 0) {
3674 DBGERR(("%s request_irq failed IRQ=%d\n",
3675 port_array[0]->device_name,
3676 port_array[0]->irq_level));
3677 } else {
3678 port_array[0]->irq_requested = true;
3679 adapter_test(port_array[0]);
3680 for (i=1 ; i < port_count ; i++) {
3681 port_array[i]->init_error = port_array[0]->init_error;
3682 port_array[i]->gpio_present = port_array[0]->gpio_present;
3683 }
3684 }
3685 }
3686
3687 for (i = 0; i < port_count; ++i) {
3688 struct slgt_info *info = port_array[i];
3689 tty_port_register_device(&info->port, serial_driver, info->line,
3690 &info->pdev->dev);
3691 }
3692}
3693
3694static int init_one(struct pci_dev *dev,
3695 const struct pci_device_id *ent)
3696{
3697 if (pci_enable_device(dev)) {
3698 printk("error enabling pci device %p\n", dev);
3699 return -EIO;
3700 }
3701 pci_set_master(dev);
3702 device_init(slgt_device_count, dev);
3703 return 0;
3704}
3705
3706static void remove_one(struct pci_dev *dev)
3707{
3708}
3709
3710static const struct tty_operations ops = {
3711 .open = open,
3712 .close = close,
3713 .write = write,
3714 .put_char = put_char,
3715 .flush_chars = flush_chars,
3716 .write_room = write_room,
3717 .chars_in_buffer = chars_in_buffer,
3718 .flush_buffer = flush_buffer,
3719 .ioctl = ioctl,
3720 .compat_ioctl = slgt_compat_ioctl,
3721 .throttle = throttle,
3722 .unthrottle = unthrottle,
3723 .send_xchar = send_xchar,
3724 .break_ctl = set_break,
3725 .wait_until_sent = wait_until_sent,
3726 .set_termios = set_termios,
3727 .stop = tx_hold,
3728 .start = tx_release,
3729 .hangup = hangup,
3730 .tiocmget = tiocmget,
3731 .tiocmset = tiocmset,
3732 .get_icount = get_icount,
3733 .proc_fops = &synclink_gt_proc_fops,
3734};
3735
3736static void slgt_cleanup(void)
3737{
3738 int rc;
3739 struct slgt_info *info;
3740 struct slgt_info *tmp;
3741
3742 printk(KERN_INFO "unload %s\n", driver_name);
3743
3744 if (serial_driver) {
3745 for (info=slgt_device_list ; info != NULL ; info=info->next_device)
3746 tty_unregister_device(serial_driver, info->line);
3747 rc = tty_unregister_driver(serial_driver);
3748 if (rc)
3749 DBGERR(("tty_unregister_driver error=%d\n", rc));
3750 put_tty_driver(serial_driver);
3751 }
3752
3753 /* reset devices */
3754 info = slgt_device_list;
3755 while(info) {
3756 reset_port(info);
3757 info = info->next_device;
3758 }
3759
3760 /* release devices */
3761 info = slgt_device_list;
3762 while(info) {
3763#if SYNCLINK_GENERIC_HDLC
3764 hdlcdev_exit(info);
3765#endif
3766 free_dma_bufs(info);
3767 free_tmp_rbuf(info);
3768 if (info->port_num == 0)
3769 release_resources(info);
3770 tmp = info;
3771 info = info->next_device;
3772 tty_port_destroy(&tmp->port);
3773 kfree(tmp);
3774 }
3775
3776 if (pci_registered)
3777 pci_unregister_driver(&pci_driver);
3778}
3779
3780/*
3781 * Driver initialization entry point.
3782 */
3783static int __init slgt_init(void)
3784{
3785 int rc;
3786
3787 printk(KERN_INFO "%s\n", driver_name);
3788
3789 serial_driver = alloc_tty_driver(MAX_DEVICES);
3790 if (!serial_driver) {
3791 printk("%s can't allocate tty driver\n", driver_name);
3792 return -ENOMEM;
3793 }
3794
3795 /* Initialize the tty_driver structure */
3796
3797 serial_driver->driver_name = slgt_driver_name;
3798 serial_driver->name = tty_dev_prefix;
3799 serial_driver->major = ttymajor;
3800 serial_driver->minor_start = 64;
3801 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
3802 serial_driver->subtype = SERIAL_TYPE_NORMAL;
3803 serial_driver->init_termios = tty_std_termios;
3804 serial_driver->init_termios.c_cflag =
3805 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
3806 serial_driver->init_termios.c_ispeed = 9600;
3807 serial_driver->init_termios.c_ospeed = 9600;
3808 serial_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
3809 tty_set_operations(serial_driver, &ops);
3810 if ((rc = tty_register_driver(serial_driver)) < 0) {
3811 DBGERR(("%s can't register serial driver\n", driver_name));
3812 put_tty_driver(serial_driver);
3813 serial_driver = NULL;
3814 goto error;
3815 }
3816
3817 printk(KERN_INFO "%s, tty major#%d\n",
3818 driver_name, serial_driver->major);
3819
3820 slgt_device_count = 0;
3821 if ((rc = pci_register_driver(&pci_driver)) < 0) {
3822 printk("%s pci_register_driver error=%d\n", driver_name, rc);
3823 goto error;
3824 }
3825 pci_registered = true;
3826
3827 if (!slgt_device_list)
3828 printk("%s no devices found\n",driver_name);
3829
3830 return 0;
3831
3832error:
3833 slgt_cleanup();
3834 return rc;
3835}
3836
3837static void __exit slgt_exit(void)
3838{
3839 slgt_cleanup();
3840}
3841
3842module_init(slgt_init);
3843module_exit(slgt_exit);
3844
3845/*
3846 * register access routines
3847 */
3848
3849#define CALC_REGADDR() \
3850 unsigned long reg_addr = ((unsigned long)info->reg_addr) + addr; \
3851 if (addr >= 0x80) \
3852 reg_addr += (info->port_num) * 32; \
3853 else if (addr >= 0x40) \
3854 reg_addr += (info->port_num) * 16;
3855
3856static __u8 rd_reg8(struct slgt_info *info, unsigned int addr)
3857{
3858 CALC_REGADDR();
3859 return readb((void __iomem *)reg_addr);
3860}
3861
3862static void wr_reg8(struct slgt_info *info, unsigned int addr, __u8 value)
3863{
3864 CALC_REGADDR();
3865 writeb(value, (void __iomem *)reg_addr);
3866}
3867
3868static __u16 rd_reg16(struct slgt_info *info, unsigned int addr)
3869{
3870 CALC_REGADDR();
3871 return readw((void __iomem *)reg_addr);
3872}
3873
3874static void wr_reg16(struct slgt_info *info, unsigned int addr, __u16 value)
3875{
3876 CALC_REGADDR();
3877 writew(value, (void __iomem *)reg_addr);
3878}
3879
3880static __u32 rd_reg32(struct slgt_info *info, unsigned int addr)
3881{
3882 CALC_REGADDR();
3883 return readl((void __iomem *)reg_addr);
3884}
3885
3886static void wr_reg32(struct slgt_info *info, unsigned int addr, __u32 value)
3887{
3888 CALC_REGADDR();
3889 writel(value, (void __iomem *)reg_addr);
3890}
3891
3892static void rdma_reset(struct slgt_info *info)
3893{
3894 unsigned int i;
3895
3896 /* set reset bit */
3897 wr_reg32(info, RDCSR, BIT1);
3898
3899 /* wait for enable bit cleared */
3900 for(i=0 ; i < 1000 ; i++)
3901 if (!(rd_reg32(info, RDCSR) & BIT0))
3902 break;
3903}
3904
3905static void tdma_reset(struct slgt_info *info)
3906{
3907 unsigned int i;
3908
3909 /* set reset bit */
3910 wr_reg32(info, TDCSR, BIT1);
3911
3912 /* wait for enable bit cleared */
3913 for(i=0 ; i < 1000 ; i++)
3914 if (!(rd_reg32(info, TDCSR) & BIT0))
3915 break;
3916}
3917
3918/*
3919 * enable internal loopback
3920 * TxCLK and RxCLK are generated from BRG
3921 * and TxD is looped back to RxD internally.
3922 */
3923static void enable_loopback(struct slgt_info *info)
3924{
3925 /* SCR (serial control) BIT2=loopback enable */
3926 wr_reg16(info, SCR, (unsigned short)(rd_reg16(info, SCR) | BIT2));
3927
3928 if (info->params.mode != MGSL_MODE_ASYNC) {
3929 /* CCR (clock control)
3930 * 07..05 tx clock source (010 = BRG)
3931 * 04..02 rx clock source (010 = BRG)
3932 * 01 auxclk enable (0 = disable)
3933 * 00 BRG enable (1 = enable)
3934 *
3935 * 0100 1001
3936 */
3937 wr_reg8(info, CCR, 0x49);
3938
3939 /* set speed if available, otherwise use default */
3940 if (info->params.clock_speed)
3941 set_rate(info, info->params.clock_speed);
3942 else
3943 set_rate(info, 3686400);
3944 }
3945}
3946
3947/*
3948 * set baud rate generator to specified rate
3949 */
3950static void set_rate(struct slgt_info *info, u32 rate)
3951{
3952 unsigned int div;
3953 unsigned int osc = info->base_clock;
3954
3955 /* div = osc/rate - 1
3956 *
3957 * Round div up if osc/rate is not integer to
3958 * force to next slowest rate.
3959 */
3960
3961 if (rate) {
3962 div = osc/rate;
3963 if (!(osc % rate) && div)
3964 div--;
3965 wr_reg16(info, BDR, (unsigned short)div);
3966 }
3967}
3968
3969static void rx_stop(struct slgt_info *info)
3970{
3971 unsigned short val;
3972
3973 /* disable and reset receiver */
3974 val = rd_reg16(info, RCR) & ~BIT1; /* clear enable bit */
3975 wr_reg16(info, RCR, (unsigned short)(val | BIT2)); /* set reset bit */
3976 wr_reg16(info, RCR, val); /* clear reset bit */
3977
3978 slgt_irq_off(info, IRQ_RXOVER + IRQ_RXDATA + IRQ_RXIDLE);
3979
3980 /* clear pending rx interrupts */
3981 wr_reg16(info, SSR, IRQ_RXIDLE + IRQ_RXOVER);
3982
3983 rdma_reset(info);
3984
3985 info->rx_enabled = false;
3986 info->rx_restart = false;
3987}
3988
3989static void rx_start(struct slgt_info *info)
3990{
3991 unsigned short val;
3992
3993 slgt_irq_off(info, IRQ_RXOVER + IRQ_RXDATA);
3994
3995 /* clear pending rx overrun IRQ */
3996 wr_reg16(info, SSR, IRQ_RXOVER);
3997
3998 /* reset and disable receiver */
3999 val = rd_reg16(info, RCR) & ~BIT1; /* clear enable bit */
4000 wr_reg16(info, RCR, (unsigned short)(val | BIT2)); /* set reset bit */
4001 wr_reg16(info, RCR, val); /* clear reset bit */
4002
4003 rdma_reset(info);
4004 reset_rbufs(info);
4005
4006 if (info->rx_pio) {
4007 /* rx request when rx FIFO not empty */
4008 wr_reg16(info, SCR, (unsigned short)(rd_reg16(info, SCR) & ~BIT14));
4009 slgt_irq_on(info, IRQ_RXDATA);
4010 if (info->params.mode == MGSL_MODE_ASYNC) {
4011 /* enable saving of rx status */
4012 wr_reg32(info, RDCSR, BIT6);
4013 }
4014 } else {
4015 /* rx request when rx FIFO half full */
4016 wr_reg16(info, SCR, (unsigned short)(rd_reg16(info, SCR) | BIT14));
4017 /* set 1st descriptor address */
4018 wr_reg32(info, RDDAR, info->rbufs[0].pdesc);
4019
4020 if (info->params.mode != MGSL_MODE_ASYNC) {
4021 /* enable rx DMA and DMA interrupt */
4022 wr_reg32(info, RDCSR, (BIT2 + BIT0));
4023 } else {
4024 /* enable saving of rx status, rx DMA and DMA interrupt */
4025 wr_reg32(info, RDCSR, (BIT6 + BIT2 + BIT0));
4026 }
4027 }
4028
4029 slgt_irq_on(info, IRQ_RXOVER);
4030
4031 /* enable receiver */
4032 wr_reg16(info, RCR, (unsigned short)(rd_reg16(info, RCR) | BIT1));
4033
4034 info->rx_restart = false;
4035 info->rx_enabled = true;
4036}
4037
4038static void tx_start(struct slgt_info *info)
4039{
4040 if (!info->tx_enabled) {
4041 wr_reg16(info, TCR,
4042 (unsigned short)((rd_reg16(info, TCR) | BIT1) & ~BIT2));
4043 info->tx_enabled = true;
4044 }
4045
4046 if (desc_count(info->tbufs[info->tbuf_start])) {
4047 info->drop_rts_on_tx_done = false;
4048
4049 if (info->params.mode != MGSL_MODE_ASYNC) {
4050 if (info->params.flags & HDLC_FLAG_AUTO_RTS) {
4051 get_signals(info);
4052 if (!(info->signals & SerialSignal_RTS)) {
4053 info->signals |= SerialSignal_RTS;
4054 set_signals(info);
4055 info->drop_rts_on_tx_done = true;
4056 }
4057 }
4058
4059 slgt_irq_off(info, IRQ_TXDATA);
4060 slgt_irq_on(info, IRQ_TXUNDER + IRQ_TXIDLE);
4061 /* clear tx idle and underrun status bits */
4062 wr_reg16(info, SSR, (unsigned short)(IRQ_TXIDLE + IRQ_TXUNDER));
4063 } else {
4064 slgt_irq_off(info, IRQ_TXDATA);
4065 slgt_irq_on(info, IRQ_TXIDLE);
4066 /* clear tx idle status bit */
4067 wr_reg16(info, SSR, IRQ_TXIDLE);
4068 }
4069 /* set 1st descriptor address and start DMA */
4070 wr_reg32(info, TDDAR, info->tbufs[info->tbuf_start].pdesc);
4071 wr_reg32(info, TDCSR, BIT2 + BIT0);
4072 info->tx_active = true;
4073 }
4074}
4075
4076static void tx_stop(struct slgt_info *info)
4077{
4078 unsigned short val;
4079
4080 del_timer(&info->tx_timer);
4081
4082 tdma_reset(info);
4083
4084 /* reset and disable transmitter */
4085 val = rd_reg16(info, TCR) & ~BIT1; /* clear enable bit */
4086 wr_reg16(info, TCR, (unsigned short)(val | BIT2)); /* set reset bit */
4087
4088 slgt_irq_off(info, IRQ_TXDATA + IRQ_TXIDLE + IRQ_TXUNDER);
4089
4090 /* clear tx idle and underrun status bit */
4091 wr_reg16(info, SSR, (unsigned short)(IRQ_TXIDLE + IRQ_TXUNDER));
4092
4093 reset_tbufs(info);
4094
4095 info->tx_enabled = false;
4096 info->tx_active = false;
4097}
4098
4099static void reset_port(struct slgt_info *info)
4100{
4101 if (!info->reg_addr)
4102 return;
4103
4104 tx_stop(info);
4105 rx_stop(info);
4106
4107 info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
4108 set_signals(info);
4109
4110 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
4111}
4112
4113static void reset_adapter(struct slgt_info *info)
4114{
4115 int i;
4116 for (i=0; i < info->port_count; ++i) {
4117 if (info->port_array[i])
4118 reset_port(info->port_array[i]);
4119 }
4120}
4121
4122static void async_mode(struct slgt_info *info)
4123{
4124 unsigned short val;
4125
4126 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
4127 tx_stop(info);
4128 rx_stop(info);
4129
4130 /* TCR (tx control)
4131 *
4132 * 15..13 mode, 010=async
4133 * 12..10 encoding, 000=NRZ
4134 * 09 parity enable
4135 * 08 1=odd parity, 0=even parity
4136 * 07 1=RTS driver control
4137 * 06 1=break enable
4138 * 05..04 character length
4139 * 00=5 bits
4140 * 01=6 bits
4141 * 10=7 bits
4142 * 11=8 bits
4143 * 03 0=1 stop bit, 1=2 stop bits
4144 * 02 reset
4145 * 01 enable
4146 * 00 auto-CTS enable
4147 */
4148 val = 0x4000;
4149
4150 if (info->if_mode & MGSL_INTERFACE_RTS_EN)
4151 val |= BIT7;
4152
4153 if (info->params.parity != ASYNC_PARITY_NONE) {
4154 val |= BIT9;
4155 if (info->params.parity == ASYNC_PARITY_ODD)
4156 val |= BIT8;
4157 }
4158
4159 switch (info->params.data_bits)
4160 {
4161 case 6: val |= BIT4; break;
4162 case 7: val |= BIT5; break;
4163 case 8: val |= BIT5 + BIT4; break;
4164 }
4165
4166 if (info->params.stop_bits != 1)
4167 val |= BIT3;
4168
4169 if (info->params.flags & HDLC_FLAG_AUTO_CTS)
4170 val |= BIT0;
4171
4172 wr_reg16(info, TCR, val);
4173
4174 /* RCR (rx control)
4175 *
4176 * 15..13 mode, 010=async
4177 * 12..10 encoding, 000=NRZ
4178 * 09 parity enable
4179 * 08 1=odd parity, 0=even parity
4180 * 07..06 reserved, must be 0
4181 * 05..04 character length
4182 * 00=5 bits
4183 * 01=6 bits
4184 * 10=7 bits
4185 * 11=8 bits
4186 * 03 reserved, must be zero
4187 * 02 reset
4188 * 01 enable
4189 * 00 auto-DCD enable
4190 */
4191 val = 0x4000;
4192
4193 if (info->params.parity != ASYNC_PARITY_NONE) {
4194 val |= BIT9;
4195 if (info->params.parity == ASYNC_PARITY_ODD)
4196 val |= BIT8;
4197 }
4198
4199 switch (info->params.data_bits)
4200 {
4201 case 6: val |= BIT4; break;
4202 case 7: val |= BIT5; break;
4203 case 8: val |= BIT5 + BIT4; break;
4204 }
4205
4206 if (info->params.flags & HDLC_FLAG_AUTO_DCD)
4207 val |= BIT0;
4208
4209 wr_reg16(info, RCR, val);
4210
4211 /* CCR (clock control)
4212 *
4213 * 07..05 011 = tx clock source is BRG/16
4214 * 04..02 010 = rx clock source is BRG
4215 * 01 0 = auxclk disabled
4216 * 00 1 = BRG enabled
4217 *
4218 * 0110 1001
4219 */
4220 wr_reg8(info, CCR, 0x69);
4221
4222 msc_set_vcr(info);
4223
4224 /* SCR (serial control)
4225 *
4226 * 15 1=tx req on FIFO half empty
4227 * 14 1=rx req on FIFO half full
4228 * 13 tx data IRQ enable
4229 * 12 tx idle IRQ enable
4230 * 11 rx break on IRQ enable
4231 * 10 rx data IRQ enable
4232 * 09 rx break off IRQ enable
4233 * 08 overrun IRQ enable
4234 * 07 DSR IRQ enable
4235 * 06 CTS IRQ enable
4236 * 05 DCD IRQ enable
4237 * 04 RI IRQ enable
4238 * 03 0=16x sampling, 1=8x sampling
4239 * 02 1=txd->rxd internal loopback enable
4240 * 01 reserved, must be zero
4241 * 00 1=master IRQ enable
4242 */
4243 val = BIT15 + BIT14 + BIT0;
4244 /* JCR[8] : 1 = x8 async mode feature available */
4245 if ((rd_reg32(info, JCR) & BIT8) && info->params.data_rate &&
4246 ((info->base_clock < (info->params.data_rate * 16)) ||
4247 (info->base_clock % (info->params.data_rate * 16)))) {
4248 /* use 8x sampling */
4249 val |= BIT3;
4250 set_rate(info, info->params.data_rate * 8);
4251 } else {
4252 /* use 16x sampling */
4253 set_rate(info, info->params.data_rate * 16);
4254 }
4255 wr_reg16(info, SCR, val);
4256
4257 slgt_irq_on(info, IRQ_RXBREAK | IRQ_RXOVER);
4258
4259 if (info->params.loopback)
4260 enable_loopback(info);
4261}
4262
4263static void sync_mode(struct slgt_info *info)
4264{
4265 unsigned short val;
4266
4267 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
4268 tx_stop(info);
4269 rx_stop(info);
4270
4271 /* TCR (tx control)
4272 *
4273 * 15..13 mode
4274 * 000=HDLC/SDLC
4275 * 001=raw bit synchronous
4276 * 010=asynchronous/isochronous
4277 * 011=monosync byte synchronous
4278 * 100=bisync byte synchronous
4279 * 101=xsync byte synchronous
4280 * 12..10 encoding
4281 * 09 CRC enable
4282 * 08 CRC32
4283 * 07 1=RTS driver control
4284 * 06 preamble enable
4285 * 05..04 preamble length
4286 * 03 share open/close flag
4287 * 02 reset
4288 * 01 enable
4289 * 00 auto-CTS enable
4290 */
4291 val = BIT2;
4292
4293 switch(info->params.mode) {
4294 case MGSL_MODE_XSYNC:
4295 val |= BIT15 + BIT13;
4296 break;
4297 case MGSL_MODE_MONOSYNC: val |= BIT14 + BIT13; break;
4298 case MGSL_MODE_BISYNC: val |= BIT15; break;
4299 case MGSL_MODE_RAW: val |= BIT13; break;
4300 }
4301 if (info->if_mode & MGSL_INTERFACE_RTS_EN)
4302 val |= BIT7;
4303
4304 switch(info->params.encoding)
4305 {
4306 case HDLC_ENCODING_NRZB: val |= BIT10; break;
4307 case HDLC_ENCODING_NRZI_MARK: val |= BIT11; break;
4308 case HDLC_ENCODING_NRZI: val |= BIT11 + BIT10; break;
4309 case HDLC_ENCODING_BIPHASE_MARK: val |= BIT12; break;
4310 case HDLC_ENCODING_BIPHASE_SPACE: val |= BIT12 + BIT10; break;
4311 case HDLC_ENCODING_BIPHASE_LEVEL: val |= BIT12 + BIT11; break;
4312 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: val |= BIT12 + BIT11 + BIT10; break;
4313 }
4314
4315 switch (info->params.crc_type & HDLC_CRC_MASK)
4316 {
4317 case HDLC_CRC_16_CCITT: val |= BIT9; break;
4318 case HDLC_CRC_32_CCITT: val |= BIT9 + BIT8; break;
4319 }
4320
4321 if (info->params.preamble != HDLC_PREAMBLE_PATTERN_NONE)
4322 val |= BIT6;
4323
4324 switch (info->params.preamble_length)
4325 {
4326 case HDLC_PREAMBLE_LENGTH_16BITS: val |= BIT5; break;
4327 case HDLC_PREAMBLE_LENGTH_32BITS: val |= BIT4; break;
4328 case HDLC_PREAMBLE_LENGTH_64BITS: val |= BIT5 + BIT4; break;
4329 }
4330
4331 if (info->params.flags & HDLC_FLAG_AUTO_CTS)
4332 val |= BIT0;
4333
4334 wr_reg16(info, TCR, val);
4335
4336 /* TPR (transmit preamble) */
4337
4338 switch (info->params.preamble)
4339 {
4340 case HDLC_PREAMBLE_PATTERN_FLAGS: val = 0x7e; break;
4341 case HDLC_PREAMBLE_PATTERN_ONES: val = 0xff; break;
4342 case HDLC_PREAMBLE_PATTERN_ZEROS: val = 0x00; break;
4343 case HDLC_PREAMBLE_PATTERN_10: val = 0x55; break;
4344 case HDLC_PREAMBLE_PATTERN_01: val = 0xaa; break;
4345 default: val = 0x7e; break;
4346 }
4347 wr_reg8(info, TPR, (unsigned char)val);
4348
4349 /* RCR (rx control)
4350 *
4351 * 15..13 mode
4352 * 000=HDLC/SDLC
4353 * 001=raw bit synchronous
4354 * 010=asynchronous/isochronous
4355 * 011=monosync byte synchronous
4356 * 100=bisync byte synchronous
4357 * 101=xsync byte synchronous
4358 * 12..10 encoding
4359 * 09 CRC enable
4360 * 08 CRC32
4361 * 07..03 reserved, must be 0
4362 * 02 reset
4363 * 01 enable
4364 * 00 auto-DCD enable
4365 */
4366 val = 0;
4367
4368 switch(info->params.mode) {
4369 case MGSL_MODE_XSYNC:
4370 val |= BIT15 + BIT13;
4371 break;
4372 case MGSL_MODE_MONOSYNC: val |= BIT14 + BIT13; break;
4373 case MGSL_MODE_BISYNC: val |= BIT15; break;
4374 case MGSL_MODE_RAW: val |= BIT13; break;
4375 }
4376
4377 switch(info->params.encoding)
4378 {
4379 case HDLC_ENCODING_NRZB: val |= BIT10; break;
4380 case HDLC_ENCODING_NRZI_MARK: val |= BIT11; break;
4381 case HDLC_ENCODING_NRZI: val |= BIT11 + BIT10; break;
4382 case HDLC_ENCODING_BIPHASE_MARK: val |= BIT12; break;
4383 case HDLC_ENCODING_BIPHASE_SPACE: val |= BIT12 + BIT10; break;
4384 case HDLC_ENCODING_BIPHASE_LEVEL: val |= BIT12 + BIT11; break;
4385 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: val |= BIT12 + BIT11 + BIT10; break;
4386 }
4387
4388 switch (info->params.crc_type & HDLC_CRC_MASK)
4389 {
4390 case HDLC_CRC_16_CCITT: val |= BIT9; break;
4391 case HDLC_CRC_32_CCITT: val |= BIT9 + BIT8; break;
4392 }
4393
4394 if (info->params.flags & HDLC_FLAG_AUTO_DCD)
4395 val |= BIT0;
4396
4397 wr_reg16(info, RCR, val);
4398
4399 /* CCR (clock control)
4400 *
4401 * 07..05 tx clock source
4402 * 04..02 rx clock source
4403 * 01 auxclk enable
4404 * 00 BRG enable
4405 */
4406 val = 0;
4407
4408 if (info->params.flags & HDLC_FLAG_TXC_BRG)
4409 {
4410 // when RxC source is DPLL, BRG generates 16X DPLL
4411 // reference clock, so take TxC from BRG/16 to get
4412 // transmit clock at actual data rate
4413 if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4414 val |= BIT6 + BIT5; /* 011, txclk = BRG/16 */
4415 else
4416 val |= BIT6; /* 010, txclk = BRG */
4417 }
4418 else if (info->params.flags & HDLC_FLAG_TXC_DPLL)
4419 val |= BIT7; /* 100, txclk = DPLL Input */
4420 else if (info->params.flags & HDLC_FLAG_TXC_RXCPIN)
4421 val |= BIT5; /* 001, txclk = RXC Input */
4422
4423 if (info->params.flags & HDLC_FLAG_RXC_BRG)
4424 val |= BIT3; /* 010, rxclk = BRG */
4425 else if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4426 val |= BIT4; /* 100, rxclk = DPLL */
4427 else if (info->params.flags & HDLC_FLAG_RXC_TXCPIN)
4428 val |= BIT2; /* 001, rxclk = TXC Input */
4429
4430 if (info->params.clock_speed)
4431 val |= BIT1 + BIT0;
4432
4433 wr_reg8(info, CCR, (unsigned char)val);
4434
4435 if (info->params.flags & (HDLC_FLAG_TXC_DPLL + HDLC_FLAG_RXC_DPLL))
4436 {
4437 // program DPLL mode
4438 switch(info->params.encoding)
4439 {
4440 case HDLC_ENCODING_BIPHASE_MARK:
4441 case HDLC_ENCODING_BIPHASE_SPACE:
4442 val = BIT7; break;
4443 case HDLC_ENCODING_BIPHASE_LEVEL:
4444 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL:
4445 val = BIT7 + BIT6; break;
4446 default: val = BIT6; // NRZ encodings
4447 }
4448 wr_reg16(info, RCR, (unsigned short)(rd_reg16(info, RCR) | val));
4449
4450 // DPLL requires a 16X reference clock from BRG
4451 set_rate(info, info->params.clock_speed * 16);
4452 }
4453 else
4454 set_rate(info, info->params.clock_speed);
4455
4456 tx_set_idle(info);
4457
4458 msc_set_vcr(info);
4459
4460 /* SCR (serial control)
4461 *
4462 * 15 1=tx req on FIFO half empty
4463 * 14 1=rx req on FIFO half full
4464 * 13 tx data IRQ enable
4465 * 12 tx idle IRQ enable
4466 * 11 underrun IRQ enable
4467 * 10 rx data IRQ enable
4468 * 09 rx idle IRQ enable
4469 * 08 overrun IRQ enable
4470 * 07 DSR IRQ enable
4471 * 06 CTS IRQ enable
4472 * 05 DCD IRQ enable
4473 * 04 RI IRQ enable
4474 * 03 reserved, must be zero
4475 * 02 1=txd->rxd internal loopback enable
4476 * 01 reserved, must be zero
4477 * 00 1=master IRQ enable
4478 */
4479 wr_reg16(info, SCR, BIT15 + BIT14 + BIT0);
4480
4481 if (info->params.loopback)
4482 enable_loopback(info);
4483}
4484
4485/*
4486 * set transmit idle mode
4487 */
4488static void tx_set_idle(struct slgt_info *info)
4489{
4490 unsigned char val;
4491 unsigned short tcr;
4492
4493 /* if preamble enabled (tcr[6] == 1) then tx idle size = 8 bits
4494 * else tcr[5:4] = tx idle size: 00 = 8 bits, 01 = 16 bits
4495 */
4496 tcr = rd_reg16(info, TCR);
4497 if (info->idle_mode & HDLC_TXIDLE_CUSTOM_16) {
4498 /* disable preamble, set idle size to 16 bits */
4499 tcr = (tcr & ~(BIT6 + BIT5)) | BIT4;
4500 /* MSB of 16 bit idle specified in tx preamble register (TPR) */
4501 wr_reg8(info, TPR, (unsigned char)((info->idle_mode >> 8) & 0xff));
4502 } else if (!(tcr & BIT6)) {
4503 /* preamble is disabled, set idle size to 8 bits */
4504 tcr &= ~(BIT5 + BIT4);
4505 }
4506 wr_reg16(info, TCR, tcr);
4507
4508 if (info->idle_mode & (HDLC_TXIDLE_CUSTOM_8 | HDLC_TXIDLE_CUSTOM_16)) {
4509 /* LSB of custom tx idle specified in tx idle register */
4510 val = (unsigned char)(info->idle_mode & 0xff);
4511 } else {
4512 /* standard 8 bit idle patterns */
4513 switch(info->idle_mode)
4514 {
4515 case HDLC_TXIDLE_FLAGS: val = 0x7e; break;
4516 case HDLC_TXIDLE_ALT_ZEROS_ONES:
4517 case HDLC_TXIDLE_ALT_MARK_SPACE: val = 0xaa; break;
4518 case HDLC_TXIDLE_ZEROS:
4519 case HDLC_TXIDLE_SPACE: val = 0x00; break;
4520 default: val = 0xff;
4521 }
4522 }
4523
4524 wr_reg8(info, TIR, val);
4525}
4526
4527/*
4528 * get state of V24 status (input) signals
4529 */
4530static void get_signals(struct slgt_info *info)
4531{
4532 unsigned short status = rd_reg16(info, SSR);
4533
4534 /* clear all serial signals except RTS and DTR */
4535 info->signals &= SerialSignal_RTS | SerialSignal_DTR;
4536
4537 if (status & BIT3)
4538 info->signals |= SerialSignal_DSR;
4539 if (status & BIT2)
4540 info->signals |= SerialSignal_CTS;
4541 if (status & BIT1)
4542 info->signals |= SerialSignal_DCD;
4543 if (status & BIT0)
4544 info->signals |= SerialSignal_RI;
4545}
4546
4547/*
4548 * set V.24 Control Register based on current configuration
4549 */
4550static void msc_set_vcr(struct slgt_info *info)
4551{
4552 unsigned char val = 0;
4553
4554 /* VCR (V.24 control)
4555 *
4556 * 07..04 serial IF select
4557 * 03 DTR
4558 * 02 RTS
4559 * 01 LL
4560 * 00 RL
4561 */
4562
4563 switch(info->if_mode & MGSL_INTERFACE_MASK)
4564 {
4565 case MGSL_INTERFACE_RS232:
4566 val |= BIT5; /* 0010 */
4567 break;
4568 case MGSL_INTERFACE_V35:
4569 val |= BIT7 + BIT6 + BIT5; /* 1110 */
4570 break;
4571 case MGSL_INTERFACE_RS422:
4572 val |= BIT6; /* 0100 */
4573 break;
4574 }
4575
4576 if (info->if_mode & MGSL_INTERFACE_MSB_FIRST)
4577 val |= BIT4;
4578 if (info->signals & SerialSignal_DTR)
4579 val |= BIT3;
4580 if (info->signals & SerialSignal_RTS)
4581 val |= BIT2;
4582 if (info->if_mode & MGSL_INTERFACE_LL)
4583 val |= BIT1;
4584 if (info->if_mode & MGSL_INTERFACE_RL)
4585 val |= BIT0;
4586 wr_reg8(info, VCR, val);
4587}
4588
4589/*
4590 * set state of V24 control (output) signals
4591 */
4592static void set_signals(struct slgt_info *info)
4593{
4594 unsigned char val = rd_reg8(info, VCR);
4595 if (info->signals & SerialSignal_DTR)
4596 val |= BIT3;
4597 else
4598 val &= ~BIT3;
4599 if (info->signals & SerialSignal_RTS)
4600 val |= BIT2;
4601 else
4602 val &= ~BIT2;
4603 wr_reg8(info, VCR, val);
4604}
4605
4606/*
4607 * free range of receive DMA buffers (i to last)
4608 */
4609static void free_rbufs(struct slgt_info *info, unsigned int i, unsigned int last)
4610{
4611 int done = 0;
4612
4613 while(!done) {
4614 /* reset current buffer for reuse */
4615 info->rbufs[i].status = 0;
4616 set_desc_count(info->rbufs[i], info->rbuf_fill_level);
4617 if (i == last)
4618 done = 1;
4619 if (++i == info->rbuf_count)
4620 i = 0;
4621 }
4622 info->rbuf_current = i;
4623}
4624
4625/*
4626 * mark all receive DMA buffers as free
4627 */
4628static void reset_rbufs(struct slgt_info *info)
4629{
4630 free_rbufs(info, 0, info->rbuf_count - 1);
4631 info->rbuf_fill_index = 0;
4632 info->rbuf_fill_count = 0;
4633}
4634
4635/*
4636 * pass receive HDLC frame to upper layer
4637 *
4638 * return true if frame available, otherwise false
4639 */
4640static bool rx_get_frame(struct slgt_info *info)
4641{
4642 unsigned int start, end;
4643 unsigned short status;
4644 unsigned int framesize = 0;
4645 unsigned long flags;
4646 struct tty_struct *tty = info->port.tty;
4647 unsigned char addr_field = 0xff;
4648 unsigned int crc_size = 0;
4649
4650 switch (info->params.crc_type & HDLC_CRC_MASK) {
4651 case HDLC_CRC_16_CCITT: crc_size = 2; break;
4652 case HDLC_CRC_32_CCITT: crc_size = 4; break;
4653 }
4654
4655check_again:
4656
4657 framesize = 0;
4658 addr_field = 0xff;
4659 start = end = info->rbuf_current;
4660
4661 for (;;) {
4662 if (!desc_complete(info->rbufs[end]))
4663 goto cleanup;
4664
4665 if (framesize == 0 && info->params.addr_filter != 0xff)
4666 addr_field = info->rbufs[end].buf[0];
4667
4668 framesize += desc_count(info->rbufs[end]);
4669
4670 if (desc_eof(info->rbufs[end]))
4671 break;
4672
4673 if (++end == info->rbuf_count)
4674 end = 0;
4675
4676 if (end == info->rbuf_current) {
4677 if (info->rx_enabled){
4678 spin_lock_irqsave(&info->lock,flags);
4679 rx_start(info);
4680 spin_unlock_irqrestore(&info->lock,flags);
4681 }
4682 goto cleanup;
4683 }
4684 }
4685
4686 /* status
4687 *
4688 * 15 buffer complete
4689 * 14..06 reserved
4690 * 05..04 residue
4691 * 02 eof (end of frame)
4692 * 01 CRC error
4693 * 00 abort
4694 */
4695 status = desc_status(info->rbufs[end]);
4696
4697 /* ignore CRC bit if not using CRC (bit is undefined) */
4698 if ((info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_NONE)
4699 status &= ~BIT1;
4700
4701 if (framesize == 0 ||
4702 (addr_field != 0xff && addr_field != info->params.addr_filter)) {
4703 free_rbufs(info, start, end);
4704 goto check_again;
4705 }
4706
4707 if (framesize < (2 + crc_size) || status & BIT0) {
4708 info->icount.rxshort++;
4709 framesize = 0;
4710 } else if (status & BIT1) {
4711 info->icount.rxcrc++;
4712 if (!(info->params.crc_type & HDLC_CRC_RETURN_EX))
4713 framesize = 0;
4714 }
4715
4716#if SYNCLINK_GENERIC_HDLC
4717 if (framesize == 0) {
4718 info->netdev->stats.rx_errors++;
4719 info->netdev->stats.rx_frame_errors++;
4720 }
4721#endif
4722
4723 DBGBH(("%s rx frame status=%04X size=%d\n",
4724 info->device_name, status, framesize));
4725 DBGDATA(info, info->rbufs[start].buf, min_t(int, framesize, info->rbuf_fill_level), "rx");
4726
4727 if (framesize) {
4728 if (!(info->params.crc_type & HDLC_CRC_RETURN_EX)) {
4729 framesize -= crc_size;
4730 crc_size = 0;
4731 }
4732
4733 if (framesize > info->max_frame_size + crc_size)
4734 info->icount.rxlong++;
4735 else {
4736 /* copy dma buffer(s) to contiguous temp buffer */
4737 int copy_count = framesize;
4738 int i = start;
4739 unsigned char *p = info->tmp_rbuf;
4740 info->tmp_rbuf_count = framesize;
4741
4742 info->icount.rxok++;
4743
4744 while(copy_count) {
4745 int partial_count = min_t(int, copy_count, info->rbuf_fill_level);
4746 memcpy(p, info->rbufs[i].buf, partial_count);
4747 p += partial_count;
4748 copy_count -= partial_count;
4749 if (++i == info->rbuf_count)
4750 i = 0;
4751 }
4752
4753 if (info->params.crc_type & HDLC_CRC_RETURN_EX) {
4754 *p = (status & BIT1) ? RX_CRC_ERROR : RX_OK;
4755 framesize++;
4756 }
4757
4758#if SYNCLINK_GENERIC_HDLC
4759 if (info->netcount)
4760 hdlcdev_rx(info,info->tmp_rbuf, framesize);
4761 else
4762#endif
4763 ldisc_receive_buf(tty, info->tmp_rbuf, info->flag_buf, framesize);
4764 }
4765 }
4766 free_rbufs(info, start, end);
4767 return true;
4768
4769cleanup:
4770 return false;
4771}
4772
4773/*
4774 * pass receive buffer (RAW synchronous mode) to tty layer
4775 * return true if buffer available, otherwise false
4776 */
4777static bool rx_get_buf(struct slgt_info *info)
4778{
4779 unsigned int i = info->rbuf_current;
4780 unsigned int count;
4781
4782 if (!desc_complete(info->rbufs[i]))
4783 return false;
4784 count = desc_count(info->rbufs[i]);
4785 switch(info->params.mode) {
4786 case MGSL_MODE_MONOSYNC:
4787 case MGSL_MODE_BISYNC:
4788 case MGSL_MODE_XSYNC:
4789 /* ignore residue in byte synchronous modes */
4790 if (desc_residue(info->rbufs[i]))
4791 count--;
4792 break;
4793 }
4794 DBGDATA(info, info->rbufs[i].buf, count, "rx");
4795 DBGINFO(("rx_get_buf size=%d\n", count));
4796 if (count)
4797 ldisc_receive_buf(info->port.tty, info->rbufs[i].buf,
4798 info->flag_buf, count);
4799 free_rbufs(info, i, i);
4800 return true;
4801}
4802
4803static void reset_tbufs(struct slgt_info *info)
4804{
4805 unsigned int i;
4806 info->tbuf_current = 0;
4807 for (i=0 ; i < info->tbuf_count ; i++) {
4808 info->tbufs[i].status = 0;
4809 info->tbufs[i].count = 0;
4810 }
4811}
4812
4813/*
4814 * return number of free transmit DMA buffers
4815 */
4816static unsigned int free_tbuf_count(struct slgt_info *info)
4817{
4818 unsigned int count = 0;
4819 unsigned int i = info->tbuf_current;
4820
4821 do
4822 {
4823 if (desc_count(info->tbufs[i]))
4824 break; /* buffer in use */
4825 ++count;
4826 if (++i == info->tbuf_count)
4827 i=0;
4828 } while (i != info->tbuf_current);
4829
4830 /* if tx DMA active, last zero count buffer is in use */
4831 if (count && (rd_reg32(info, TDCSR) & BIT0))
4832 --count;
4833
4834 return count;
4835}
4836
4837/*
4838 * return number of bytes in unsent transmit DMA buffers
4839 * and the serial controller tx FIFO
4840 */
4841static unsigned int tbuf_bytes(struct slgt_info *info)
4842{
4843 unsigned int total_count = 0;
4844 unsigned int i = info->tbuf_current;
4845 unsigned int reg_value;
4846 unsigned int count;
4847 unsigned int active_buf_count = 0;
4848
4849 /*
4850 * Add descriptor counts for all tx DMA buffers.
4851 * If count is zero (cleared by DMA controller after read),
4852 * the buffer is complete or is actively being read from.
4853 *
4854 * Record buf_count of last buffer with zero count starting
4855 * from current ring position. buf_count is mirror
4856 * copy of count and is not cleared by serial controller.
4857 * If DMA controller is active, that buffer is actively
4858 * being read so add to total.
4859 */
4860 do {
4861 count = desc_count(info->tbufs[i]);
4862 if (count)
4863 total_count += count;
4864 else if (!total_count)
4865 active_buf_count = info->tbufs[i].buf_count;
4866 if (++i == info->tbuf_count)
4867 i = 0;
4868 } while (i != info->tbuf_current);
4869
4870 /* read tx DMA status register */
4871 reg_value = rd_reg32(info, TDCSR);
4872
4873 /* if tx DMA active, last zero count buffer is in use */
4874 if (reg_value & BIT0)
4875 total_count += active_buf_count;
4876
4877 /* add tx FIFO count = reg_value[15..8] */
4878 total_count += (reg_value >> 8) & 0xff;
4879
4880 /* if transmitter active add one byte for shift register */
4881 if (info->tx_active)
4882 total_count++;
4883
4884 return total_count;
4885}
4886
4887/*
4888 * load data into transmit DMA buffer ring and start transmitter if needed
4889 * return true if data accepted, otherwise false (buffers full)
4890 */
4891static bool tx_load(struct slgt_info *info, const char *buf, unsigned int size)
4892{
4893 unsigned short count;
4894 unsigned int i;
4895 struct slgt_desc *d;
4896
4897 /* check required buffer space */
4898 if (DIV_ROUND_UP(size, DMABUFSIZE) > free_tbuf_count(info))
4899 return false;
4900
4901 DBGDATA(info, buf, size, "tx");
4902
4903 /*
4904 * copy data to one or more DMA buffers in circular ring
4905 * tbuf_start = first buffer for this data
4906 * tbuf_current = next free buffer
4907 *
4908 * Copy all data before making data visible to DMA controller by
4909 * setting descriptor count of the first buffer.
4910 * This prevents an active DMA controller from reading the first DMA
4911 * buffers of a frame and stopping before the final buffers are filled.
4912 */
4913
4914 info->tbuf_start = i = info->tbuf_current;
4915
4916 while (size) {
4917 d = &info->tbufs[i];
4918
4919 count = (unsigned short)((size > DMABUFSIZE) ? DMABUFSIZE : size);
4920 memcpy(d->buf, buf, count);
4921
4922 size -= count;
4923 buf += count;
4924
4925 /*
4926 * set EOF bit for last buffer of HDLC frame or
4927 * for every buffer in raw mode
4928 */
4929 if ((!size && info->params.mode == MGSL_MODE_HDLC) ||
4930 info->params.mode == MGSL_MODE_RAW)
4931 set_desc_eof(*d, 1);
4932 else
4933 set_desc_eof(*d, 0);
4934
4935 /* set descriptor count for all but first buffer */
4936 if (i != info->tbuf_start)
4937 set_desc_count(*d, count);
4938 d->buf_count = count;
4939
4940 if (++i == info->tbuf_count)
4941 i = 0;
4942 }
4943
4944 info->tbuf_current = i;
4945
4946 /* set first buffer count to make new data visible to DMA controller */
4947 d = &info->tbufs[info->tbuf_start];
4948 set_desc_count(*d, d->buf_count);
4949
4950 /* start transmitter if needed and update transmit timeout */
4951 if (!info->tx_active)
4952 tx_start(info);
4953 update_tx_timer(info);
4954
4955 return true;
4956}
4957
4958static int register_test(struct slgt_info *info)
4959{
4960 static unsigned short patterns[] =
4961 {0x0000, 0xffff, 0xaaaa, 0x5555, 0x6969, 0x9696};
4962 static unsigned int count = ARRAY_SIZE(patterns);
4963 unsigned int i;
4964 int rc = 0;
4965
4966 for (i=0 ; i < count ; i++) {
4967 wr_reg16(info, TIR, patterns[i]);
4968 wr_reg16(info, BDR, patterns[(i+1)%count]);
4969 if ((rd_reg16(info, TIR) != patterns[i]) ||
4970 (rd_reg16(info, BDR) != patterns[(i+1)%count])) {
4971 rc = -ENODEV;
4972 break;
4973 }
4974 }
4975 info->gpio_present = (rd_reg32(info, JCR) & BIT5) ? 1 : 0;
4976 info->init_error = rc ? 0 : DiagStatus_AddressFailure;
4977 return rc;
4978}
4979
4980static int irq_test(struct slgt_info *info)
4981{
4982 unsigned long timeout;
4983 unsigned long flags;
4984 struct tty_struct *oldtty = info->port.tty;
4985 u32 speed = info->params.data_rate;
4986
4987 info->params.data_rate = 921600;
4988 info->port.tty = NULL;
4989
4990 spin_lock_irqsave(&info->lock, flags);
4991 async_mode(info);
4992 slgt_irq_on(info, IRQ_TXIDLE);
4993
4994 /* enable transmitter */
4995 wr_reg16(info, TCR,
4996 (unsigned short)(rd_reg16(info, TCR) | BIT1));
4997
4998 /* write one byte and wait for tx idle */
4999 wr_reg16(info, TDR, 0);
5000
5001 /* assume failure */
5002 info->init_error = DiagStatus_IrqFailure;
5003 info->irq_occurred = false;
5004
5005 spin_unlock_irqrestore(&info->lock, flags);
5006
5007 timeout=100;
5008 while(timeout-- && !info->irq_occurred)
5009 msleep_interruptible(10);
5010
5011 spin_lock_irqsave(&info->lock,flags);
5012 reset_port(info);
5013 spin_unlock_irqrestore(&info->lock,flags);
5014
5015 info->params.data_rate = speed;
5016 info->port.tty = oldtty;
5017
5018 info->init_error = info->irq_occurred ? 0 : DiagStatus_IrqFailure;
5019 return info->irq_occurred ? 0 : -ENODEV;
5020}
5021
5022static int loopback_test_rx(struct slgt_info *info)
5023{
5024 unsigned char *src, *dest;
5025 int count;
5026
5027 if (desc_complete(info->rbufs[0])) {
5028 count = desc_count(info->rbufs[0]);
5029 src = info->rbufs[0].buf;
5030 dest = info->tmp_rbuf;
5031
5032 for( ; count ; count-=2, src+=2) {
5033 /* src=data byte (src+1)=status byte */
5034 if (!(*(src+1) & (BIT9 + BIT8))) {
5035 *dest = *src;
5036 dest++;
5037 info->tmp_rbuf_count++;
5038 }
5039 }
5040 DBGDATA(info, info->tmp_rbuf, info->tmp_rbuf_count, "rx");
5041 return 1;
5042 }
5043 return 0;
5044}
5045
5046static int loopback_test(struct slgt_info *info)
5047{
5048#define TESTFRAMESIZE 20
5049
5050 unsigned long timeout;
5051 u16 count = TESTFRAMESIZE;
5052 unsigned char buf[TESTFRAMESIZE];
5053 int rc = -ENODEV;
5054 unsigned long flags;
5055
5056 struct tty_struct *oldtty = info->port.tty;
5057 MGSL_PARAMS params;
5058
5059 memcpy(¶ms, &info->params, sizeof(params));
5060
5061 info->params.mode = MGSL_MODE_ASYNC;
5062 info->params.data_rate = 921600;
5063 info->params.loopback = 1;
5064 info->port.tty = NULL;
5065
5066 /* build and send transmit frame */
5067 for (count = 0; count < TESTFRAMESIZE; ++count)
5068 buf[count] = (unsigned char)count;
5069
5070 info->tmp_rbuf_count = 0;
5071 memset(info->tmp_rbuf, 0, TESTFRAMESIZE);
5072
5073 /* program hardware for HDLC and enabled receiver */
5074 spin_lock_irqsave(&info->lock,flags);
5075 async_mode(info);
5076 rx_start(info);
5077 tx_load(info, buf, count);
5078 spin_unlock_irqrestore(&info->lock, flags);
5079
5080 /* wait for receive complete */
5081 for (timeout = 100; timeout; --timeout) {
5082 msleep_interruptible(10);
5083 if (loopback_test_rx(info)) {
5084 rc = 0;
5085 break;
5086 }
5087 }
5088
5089 /* verify received frame length and contents */
5090 if (!rc && (info->tmp_rbuf_count != count ||
5091 memcmp(buf, info->tmp_rbuf, count))) {
5092 rc = -ENODEV;
5093 }
5094
5095 spin_lock_irqsave(&info->lock,flags);
5096 reset_adapter(info);
5097 spin_unlock_irqrestore(&info->lock,flags);
5098
5099 memcpy(&info->params, ¶ms, sizeof(info->params));
5100 info->port.tty = oldtty;
5101
5102 info->init_error = rc ? DiagStatus_DmaFailure : 0;
5103 return rc;
5104}
5105
5106static int adapter_test(struct slgt_info *info)
5107{
5108 DBGINFO(("testing %s\n", info->device_name));
5109 if (register_test(info) < 0) {
5110 printk("register test failure %s addr=%08X\n",
5111 info->device_name, info->phys_reg_addr);
5112 } else if (irq_test(info) < 0) {
5113 printk("IRQ test failure %s IRQ=%d\n",
5114 info->device_name, info->irq_level);
5115 } else if (loopback_test(info) < 0) {
5116 printk("loopback test failure %s\n", info->device_name);
5117 }
5118 return info->init_error;
5119}
5120
5121/*
5122 * transmit timeout handler
5123 */
5124static void tx_timeout(unsigned long context)
5125{
5126 struct slgt_info *info = (struct slgt_info*)context;
5127 unsigned long flags;
5128
5129 DBGINFO(("%s tx_timeout\n", info->device_name));
5130 if(info->tx_active && info->params.mode == MGSL_MODE_HDLC) {
5131 info->icount.txtimeout++;
5132 }
5133 spin_lock_irqsave(&info->lock,flags);
5134 tx_stop(info);
5135 spin_unlock_irqrestore(&info->lock,flags);
5136
5137#if SYNCLINK_GENERIC_HDLC
5138 if (info->netcount)
5139 hdlcdev_tx_done(info);
5140 else
5141#endif
5142 bh_transmit(info);
5143}
5144
5145/*
5146 * receive buffer polling timer
5147 */
5148static void rx_timeout(unsigned long context)
5149{
5150 struct slgt_info *info = (struct slgt_info*)context;
5151 unsigned long flags;
5152
5153 DBGINFO(("%s rx_timeout\n", info->device_name));
5154 spin_lock_irqsave(&info->lock, flags);
5155 info->pending_bh |= BH_RECEIVE;
5156 spin_unlock_irqrestore(&info->lock, flags);
5157 bh_handler(&info->task);
5158}
5159